diff --git a/config/business_rules.action.test.yml b/config/business_rules.action.test.yml
new file mode 100644
index 0000000..0a8935b
--- /dev/null
+++ b/config/business_rules.action.test.yml
@@ -0,0 +1,20 @@
+uuid: 2413d003-09ef-49e7-b1b5-6663c3acdee5
+langcode: en
+status: true
+dependencies: {  }
+id: test
+label: 'send email'
+description: test
+settings:
+  use_site_mail_as_sender: true
+  from: ''
+  to: naomi@aktivix.org
+  subject: test
+  format: text
+  body:
+    value: "<p>test</p>\r\n"
+    format: full_html
+tags: {  }
+type: send_email
+target_entity_type: null
+target_bundle: null
diff --git a/config/business_rules.business_rule.email_notification_for_follow_up_due.yml b/config/business_rules.business_rule.email_notification_for_follow_up_due.yml
new file mode 100644
index 0000000..d98efc7
--- /dev/null
+++ b/config/business_rules.business_rule.email_notification_for_follow_up_due.yml
@@ -0,0 +1,13 @@
+uuid: bb3e5774-81c5-44cb-93af-f8912b6ae421
+langcode: en
+status: true
+dependencies: {  }
+description: 'When a client gets the status "3-month follow-up due" or "6-month follow-up due", an email will be sent to the specified address.'
+id: email_notification_for_follow_up_due
+label: 'Email notification for follow-up due'
+enabled: null
+reacts_on: entity_update
+items: {  }
+tags: {  }
+target_bundle: client
+target_entity_type: oc_organisation
diff --git a/config/business_rules.condition.whether_a_follow_up_is_due_on_this_client.yml b/config/business_rules.condition.whether_a_follow_up_is_due_on_this_client.yml
new file mode 100644
index 0000000..e7b56bd
--- /dev/null
+++ b/config/business_rules.condition.whether_a_follow_up_is_due_on_this_client.yml
@@ -0,0 +1,18 @@
+uuid: 435acfc6-3c1a-4182-bc8d-8de03599c754
+langcode: en
+status: true
+dependencies:
+  config:
+    - business_rules.action.test
+id: whether_a_follow_up_is_due_on_this_client
+label: 'Whether a follow-up is due on this client'
+description: 'True if client substatus is one of "3-month follow-up due", "6-month follow-up due"'
+settings:
+  field: field_client_substatus
+  data_to_compare: current_data
+  operator: '=='
+  value_to_compare: '25'
+tags: {  }
+type: data_comparison
+target_entity_type: oc_organisation
+target_bundle: client
diff --git a/config/core.entity_form_display.oc_organisation.umbrella_client.default.yml b/config/core.entity_form_display.oc_organisation.umbrella_client.default.yml
index d4e0039..4ee3854 100644
--- a/config/core.entity_form_display.oc_organisation.umbrella_client.default.yml
+++ b/config/core.entity_form_display.oc_organisation.umbrella_client.default.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - field.field.oc_organisation.umbrella_client.field_tags
+    - field.field.oc_organisation.umbrella_client.field_test
     - field.field.oc_organisation.umbrella_client.field_type_of_umbrella_client
     - opencase_entities.oc_organisation_type.umbrella_client
   module:
@@ -25,6 +26,16 @@ content:
     third_party_settings: {  }
     type: entity_reference_autocomplete
     region: content
+  field_test:
+    weight: 63
+    settings:
+      match_operator: CONTAINS
+      match_limit: 10
+      size: 60
+      placeholder: ''
+    third_party_settings: {  }
+    type: entity_reference_autocomplete
+    region: content
   field_type_of_umbrella_client:
     weight: -99
     settings: {  }
diff --git a/config/core.entity_view_display.oc_organisation.umbrella_client.default.yml b/config/core.entity_view_display.oc_organisation.umbrella_client.default.yml
index 44a9881..4d695e0 100644
--- a/config/core.entity_view_display.oc_organisation.umbrella_client.default.yml
+++ b/config/core.entity_view_display.oc_organisation.umbrella_client.default.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - field.field.oc_organisation.umbrella_client.field_tags
+    - field.field.oc_organisation.umbrella_client.field_test
     - field.field.oc_organisation.umbrella_client.field_type_of_umbrella_client
     - opencase_entities.oc_organisation_type.umbrella_client
   module:
@@ -29,6 +30,14 @@ content:
     third_party_settings: {  }
     type: entity_reference_label
     region: content
+  field_test:
+    weight: 62
+    label: above
+    settings:
+      link: true
+    third_party_settings: {  }
+    type: entity_reference_label
+    region: content
   field_type_of_umbrella_client:
     weight: 4
     label: above
diff --git a/config/field.field.oc_organisation.umbrella_client.field_test.yml b/config/field.field.oc_organisation.umbrella_client.field_test.yml
new file mode 100644
index 0000000..9d4f885
--- /dev/null
+++ b/config/field.field.oc_organisation.umbrella_client.field_test.yml
@@ -0,0 +1,21 @@
+uuid: ece7aa0b-b142-4be3-8947-49fbf2efd0c7
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.oc_organisation.field_test
+    - opencase_entities.oc_organisation_type.umbrella_client
+id: oc_organisation.umbrella_client.field_test
+field_name: field_test
+entity_type: oc_organisation
+bundle: umbrella_client
+label: test
+description: ''
+required: false
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:taxonomy_term'
+  handler_settings: {  }
+field_type: entity_reference
diff --git a/config/field.storage.oc_organisation.field_test.yml b/config/field.storage.oc_organisation.field_test.yml
new file mode 100644
index 0000000..5de37e5
--- /dev/null
+++ b/config/field.storage.oc_organisation.field_test.yml
@@ -0,0 +1,20 @@
+uuid: 60fe4fa2-1a5b-41f4-aa5b-4bef0b17b465
+langcode: en
+status: true
+dependencies:
+  module:
+    - opencase_entities
+    - taxonomy
+id: oc_organisation.field_test
+field_name: field_test
+entity_type: oc_organisation
+type: entity_reference
+settings:
+  target_type: taxonomy_term
+module: core
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false