diff --git a/rero_ils/bundles.py b/rero_ils/bundles.py
index 9c09b02f03..5a34c118c9 100644
--- a/rero_ils/bundles.py
+++ b/rero_ils/bundles.py
@@ -86,6 +86,12 @@ def catalog(domain):
     output='gen/rero_ils.tab.%(version)s.js'
 )
 
+tooltips_js = Bundle(
+    'node_modules/bootstrap-sass/assets/javascripts/bootstrap/tooltip.js',
+    'js/rero_ils/tooltips.js',
+    output='gen/rero_ils.tooltip.%(version)s.js'
+)
+
 _search_js = NpmBundle(
     'js/rero_ils/documents_items.js',
     'js/rero_ils/invenio_config.js',
diff --git a/rero_ils/config.py b/rero_ils/config.py
index 4872a49675..d3705bdf36 100644
--- a/rero_ils/config.py
+++ b/rero_ils/config.py
@@ -225,7 +225,7 @@ def _(x):
         search_type=None,
         record_serializers={
             'application/json': ('invenio_records_rest.serializers'
-                                 ':json_v1_response'),
+                                 ':json_v1_response')
         },
         search_serializers={
             'application/rero+json': ('rero_ils.modules.serializers'
diff --git a/rero_ils/modules/api.py b/rero_ils/modules/api.py
index 9f03f06b5e..5562c87a4c 100644
--- a/rero_ils/modules/api.py
+++ b/rero_ils/modules/api.py
@@ -149,6 +149,11 @@ def delete_from_index(self):
         except NotFoundError:
             pass
 
+    @property
+    def can_delete(self):
+        """Record can be deleted."""
+        return True
+
     @property
     def pid(self):
         """Get ils record pid value."""
@@ -220,6 +225,11 @@ def remove_element(self, element, force=False, delindex=False):
         self.reindex(forceindex=True)
         return to_return
 
+    @property
+    def can_delete(self):
+        """Record can be deleted."""
+        return len(self.elements) == 0
+
     @property
     def elements(self):
         """Return an array of elements."""
diff --git a/rero_ils/modules/documents_items/serializers.py b/rero_ils/modules/documents_items/serializers.py
index 374d2ebe75..1c1de666c7 100644
--- a/rero_ils/modules/documents_items/serializers.py
+++ b/rero_ils/modules/documents_items/serializers.py
@@ -44,19 +44,8 @@ def format_record(self, record):
 
         bib_fields.append(str(record.get('publicationYear', '')))
         bib_str = ','.join(['"%s"' % v for v in bib_fields])
-        items = []
-        for citem in record.get('citems', []):
-            item_fields = []
-            item_fields.append(str(citem.get('barcode')))
-            item_fields.append(str(citem.get('call_number')))
-            item_fields.append(str(citem.get('location')))
-            item_fields.append(
-                str(citem.get('_circulation', {}).get('status'))
-            )
-            item_str = ','.join(['"%s"' % v for v in item_fields])
-            items.append(','.join((bib_str, item_str)))
-
-        return '\n'.join(items)
+
+        return bib_str
 
     def serialize(self, pid, record, links_factory=None):
         """Serialize a single record and persistent identifier.
@@ -65,6 +54,7 @@ def serialize(self, pid, record, links_factory=None):
         :param record: Record instance.
         :param links_factory: Factory function for record links.
         """
+        print('++++>', record, flush=True)
         return self.format_record(record)
 
     def serialize_search(self, pid_fetcher, search_result, links=None,
@@ -81,6 +71,7 @@ def serialize_search(self, pid_fetcher, search_result, links=None,
 
         return "\n".join(records)
 
+
 documents_items_csv_v1 = TextSerializer()
 documents_items_csv_v1_response = record_responsify(
     documents_items_csv_v1, 'text/csv'
diff --git a/rero_ils/modules/documents_items/static/js/rero_ils/documents_items.js b/rero_ils/modules/documents_items/static/js/rero_ils/documents_items.js
index b3a09b16e4..a6986cb0ca 100644
--- a/rero_ils/modules/documents_items/static/js/rero_ils/documents_items.js
+++ b/rero_ils/modules/documents_items/static/js/rero_ils/documents_items.js
@@ -2,7 +2,7 @@ angular.module('reroilsUtils', [])
 
     .controller('exportController', ['$scope', function($scope) {
       $scope.csvURL = function() {
-        return window.location.href.toString().replace('search', 'api/export/records/csv').replace(/size=\d+/, 'size=19999');
+        return window.location.href.toString().replace('search', 'api/export/documents/csv').replace(/size=\d+/, 'size=19999');
       };
     }])
 
diff --git a/rero_ils/modules/documents_items/templates/rero_ils/detailed_view_documents_items.html b/rero_ils/modules/documents_items/templates/rero_ils/detailed_view_documents_items.html
index f93b7f89da..159e10b368 100644
--- a/rero_ils/modules/documents_items/templates/rero_ils/detailed_view_documents_items.html
+++ b/rero_ils/modules/documents_items/templates/rero_ils/detailed_view_documents_items.html
@@ -235,7 +235,8 @@ <h1>{{record.title}}</h1>
     {% with
       href_update=url_for('reroils_record_editor.update_doc', pid=record.pid),
       href_delete=url_for('reroils_record_editor.delete_doc', pid=record.pid),
-      json=record
+      json=record,
+      message=_("Document cannot be deleted: there are still items linked to this document.")
     %}
       {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
@@ -377,7 +378,8 @@ <h3>{{_('Items')}}
             {% with
                 href_update=url_for('reroils_record_editor.update_item', pid=item.pid, parent_pid=record.pid),
                 href_delete=url_for('reroils_record_editor.delete_item', pid=item.pid, parent_pid=record.pid),
-                json=item
+                json=item,
+                message=_("Item cannot be deleted: there are still transactions linked to this item.")
             %}
                 {% include 'reroils_record_editor/_button_actions.html' %}
             {% endwith %}
@@ -422,4 +424,5 @@ <h3>{{_('Export Formats')}}</h3>
 {%- block javascript %}
 {{ super() }}
 {% assets "rero_ils_detailed_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
 {%- endblock javascript %}
diff --git a/rero_ils/modules/items/api.py b/rero_ils/modules/items/api.py
index 3f88b97662..3c60b238d5 100644
--- a/rero_ils/modules/items/api.py
+++ b/rero_ils/modules/items/api.py
@@ -387,6 +387,11 @@ def available(self):
         return self.status == ItemStatus.ON_SHELF and\
             self.number_of_item_requests() == 0
 
+    @property
+    def can_delete(self):
+        """Record can be deleted."""
+        return self.available
+
     # ??? name ???
     @check_status(statuses=[ItemStatus.ON_LOAN])
     def extend_loan(
diff --git a/rero_ils/modules/items/templates/rero_ils/_item_head.html b/rero_ils/modules/items/templates/rero_ils/_item_head.html
index b8750d0a2a..637cbffdac 100644
--- a/rero_ils/modules/items/templates/rero_ils/_item_head.html
+++ b/rero_ils/modules/items/templates/rero_ils/_item_head.html
@@ -57,8 +57,14 @@ <h1>{{ item_dumps.barcode }}</a></h1>
     {% with
         href_update=url_for('reroils_record_editor.update_item', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_item', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Item cannot be deleted: there are still transactions linked to this item.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
 </div>
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/modules/items/views.py b/rero_ils/modules/items/views.py
index 524809ec55..f71fb4e567 100644
--- a/rero_ils/modules/items/views.py
+++ b/rero_ils/modules/items/views.py
@@ -38,6 +38,7 @@
 from invenio_records_ui.signals import record_viewed
 from reroils_record_editor.permissions import record_edit_permission
 
+from ...filter import format_date_filter
 from ...permissions import request_item_permission
 from ..documents_items.api import DocumentsWithItems
 from ..patrons.api import Patron
diff --git a/rero_ils/modules/locations/api.py b/rero_ils/modules/locations/api.py
index f89208afe2..22a70ffbd6 100644
--- a/rero_ils/modules/locations/api.py
+++ b/rero_ils/modules/locations/api.py
@@ -25,6 +25,7 @@
 """API for manipulating locations."""
 
 from invenio_pidstore.models import PersistentIdentifier
+from invenio_search.api import RecordsSearch
 
 from ..api import IlsRecord
 from ..members_locations.models import MembersLocationsMetadata
@@ -33,6 +34,15 @@
 from .providers import LocationProvider
 
 
+class LocationsSearch(RecordsSearch):
+    """RecordsSearch for borrowed documents."""
+
+    class Meta:
+        """Search only on documents index."""
+
+        index = 'documents'
+
+
 class Location(IlsRecord):
     """Location class."""
 
@@ -60,3 +70,20 @@ def get_all_pids(cls):
             locs_id.append(pid.pid_value)
 
         return locs_id
+
+    def get_all_items_pids(self):
+        """Get all items pids."""
+        items_with_location = LocationsSearch().filter(
+            "term", **{"itemslist.location_pid": self.pid}
+        ).source(includes=['itemslist.pid']).scan()
+        pids = []
+        for document in items_with_location:
+            for items in document['itemslist']:
+                item = items.to_dict()
+                pids.append(item.get('pid'))
+        return sorted(pids, key=int)
+
+    @property
+    def can_delete(self):
+        """Record can be deleted."""
+        return len(self.get_all_items_pids()) == 0
diff --git a/rero_ils/modules/locations/templates/rero_ils/detailed_view_locations.html b/rero_ils/modules/locations/templates/rero_ils/detailed_view_locations.html
index 2b246fe7f6..35f25e8910 100644
--- a/rero_ils/modules/locations/templates/rero_ils/detailed_view_locations.html
+++ b/rero_ils/modules/locations/templates/rero_ils/detailed_view_locations.html
@@ -22,10 +22,16 @@ <h1>{{record.name}}</h1>
     {% with
         href_update=url_for('reroils_record_editor.update_loc', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_loc', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Location cannot be deleted: there are still items linked to this location.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
 
 </div>
 {%- endblock %}
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/modules/members_locations/templates/rero_ils/detailed_view_members_locations.html b/rero_ils/modules/members_locations/templates/rero_ils/detailed_view_members_locations.html
index ba0d4355e6..ff1a73cf85 100644
--- a/rero_ils/modules/members_locations/templates/rero_ils/detailed_view_members_locations.html
+++ b/rero_ils/modules/members_locations/templates/rero_ils/detailed_view_members_locations.html
@@ -45,7 +45,8 @@ <h1>{{record.name}}</h1>
    {% with
         href_update=url_for('reroils_record_editor.update_memb', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_memb', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Library cannot be deleted: there are still locations linked to this library.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
@@ -85,7 +86,8 @@ <h2>{{ location.name }}</h2>
     {% with
         href_update=url_for('reroils_record_editor.update_loc', pid=record.pid, parent_pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_loc', pid=record.pid, parent_pid=record.pid),
-        json=location
+        json=location,
+        message=_("Location cannot be deleted: there are still items linked to this location.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
@@ -96,3 +98,8 @@ <h2>{{ location.name }}</h2>
 
 </div>
 {%- endblock %}
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/modules/organisations/templates/rero_ils/detailed_view_organisations.html b/rero_ils/modules/organisations/templates/rero_ils/detailed_view_organisations.html
index 193ab24e30..78ff205ee3 100644
--- a/rero_ils/modules/organisations/templates/rero_ils/detailed_view_organisations.html
+++ b/rero_ils/modules/organisations/templates/rero_ils/detailed_view_organisations.html
@@ -98,10 +98,16 @@ <h3>{{_('Locations')}}</h3>
     {% with
         href_update=url_for('reroils_record_editor.update_org', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_org', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Organisation cannot be deleted: there are still libraries linked to this organisation.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
 
 </div>
 {%- endblock %}
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/modules/organisations_members/templates/rero_ils/detailed_view_organisations_members.html b/rero_ils/modules/organisations_members/templates/rero_ils/detailed_view_organisations_members.html
index e738ec974a..9fae4cf5bf 100644
--- a/rero_ils/modules/organisations_members/templates/rero_ils/detailed_view_organisations_members.html
+++ b/rero_ils/modules/organisations_members/templates/rero_ils/detailed_view_organisations_members.html
@@ -22,7 +22,8 @@ <h1>{{record.name}}</h1>
     {% with
         href_update=url_for('reroils_record_editor.update_org', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_org', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Organisation cannot be deleted: there are still libraries linked to this organisation.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
@@ -87,7 +88,8 @@ <h2>
     {% with
         href_update=url_for('reroils_record_editor.update_memb', pid=member.pid, parent_pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_memb', pid=member.pid, parent_pid=record.pid),
-        json=member
+        json=member,
+        message=_("Library cannot be deleted: there are still locations linked to this library.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
@@ -99,3 +101,8 @@ <h2>
   {%- endblock %}
 </div>
 {%- endblock %}
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/modules/patrons/api.py b/rero_ils/modules/patrons/api.py
index 53fc20795f..900d20228e 100644
--- a/rero_ils/modules/patrons/api.py
+++ b/rero_ils/modules/patrons/api.py
@@ -180,6 +180,11 @@ def dumps(self, **kwargs):
         ))
         return data
 
+    @property
+    def can_delete(self):
+        """Record can be deleted."""
+        return len(self.get_borrowed_documents_pids) == 0
+
     @property
     def roles(self):
         """Return user roles."""
diff --git a/rero_ils/modules/patrons/templates/rero_ils/detailed_view_patrons.html b/rero_ils/modules/patrons/templates/rero_ils/detailed_view_patrons.html
index f7d46b9b6e..e89e389724 100644
--- a/rero_ils/modules/patrons/templates/rero_ils/detailed_view_patrons.html
+++ b/rero_ils/modules/patrons/templates/rero_ils/detailed_view_patrons.html
@@ -110,9 +110,15 @@ <h1>{{record.last_name}}, {{record.first_name}}</h1>
     {% with
         href_update=url_for('reroils_record_editor.update_ptrn', pid=record.pid),
         href_delete=url_for('reroils_record_editor.delete_ptrn', pid=record.pid),
-        json=record
+        json=record,
+        message=_("Patron cannot be deleted: there are still transactions or fees linked to this patron.")
     %}
         {% include 'reroils_record_editor/_button_actions.html' %}
     {% endwith %}
 </div>
 {%- endblock %}
+
+{%- block javascript %}
+{{ super() }}
+{% assets "rero_ils_tooltips_js" %}<script src="{{ ASSET_URL }}"></script>{% endassets %}
+{%- endblock javascript %}
diff --git a/rero_ils/static/js/rero_ils/tooltips.js b/rero_ils/static/js/rero_ils/tooltips.js
new file mode 100644
index 0000000000..4f904029ca
--- /dev/null
+++ b/rero_ils/static/js/rero_ils/tooltips.js
@@ -0,0 +1,3 @@
+$(document).ready(function(){
+    $('[data-toggle="tooltip"]').tooltip();
+});
diff --git a/setup.py b/setup.py
index f491a70abe..f6b9c0ad52 100644
--- a/setup.py
+++ b/setup.py
@@ -104,6 +104,7 @@ def run(self):
             'messages = rero_ils',
         ],
         'invenio_assets.bundles': [
+            'rero_ils_tooltips_js = rero_ils.bundles:tooltips_js',
             'rero_ils_person_search_js = rero_ils.bundles:person_js',
             'rero_ils_detailed_js = rero_ils.bundles:detailed_js',
             'rero_ils_search_js = rero_ils.bundles:search_js',