diff --git a/app/contracts/project_custom_field_project_mappings/base_contract.rb b/app/contracts/project_custom_field_project_mappings/base_contract.rb
index 0d506e33dc3..580a3855532 100644
--- a/app/contracts/project_custom_field_project_mappings/base_contract.rb
+++ b/app/contracts/project_custom_field_project_mappings/base_contract.rb
@@ -34,8 +34,8 @@ module ProjectCustomFieldProjectMappings
     attribute :custom_field_id
 
     validate :select_project_custom_fields_permission
-    validate :not_required
-    validate :visbile_to_user
+    validate :not_for_all_projects
+    validate :visible_to_user
 
     def select_project_custom_fields_permission
       return if user.allowed_in_project?(:select_project_custom_fields, model.project)
@@ -43,15 +43,15 @@ module ProjectCustomFieldProjectMappings
       errors.add :base, :error_unauthorized
     end
 
-    def not_required
-      # only mappings of custom fields which are not required can be manipulated by the user
-      # enabling a custom field which is required happens in an after_save hook within the custom field model itself
-      return if model.project_custom_field.nil? || !model.project_custom_field.required?
+    def not_for_all_projects
+      # only mappings of custom fields which are not activated for all projects can be manipulated by the user
+      # enabling a custom field which is force-active happens in an after_save hook within the custom field model itself
+      return if model.project_custom_field.nil? || !model.project_custom_field.is_for_all?
 
       errors.add :custom_field_id, :cannot_delete_mapping
     end
 
-    def visbile_to_user
+    def visible_to_user
       # "invisible" custom fields can only be seen and edited by admins
       # using visible scope to check if the custom field is actually visible to the user
       return if model.project_custom_field.nil? ||
diff --git a/app/services/project_custom_field_project_mappings/bulk_update_service.rb b/app/services/project_custom_field_project_mappings/bulk_update_service.rb
index 009d9a401f1..908505cf5a4 100644
--- a/app/services/project_custom_field_project_mappings/bulk_update_service.rb
+++ b/app/services/project_custom_field_project_mappings/bulk_update_service.rb
@@ -84,11 +84,11 @@ module ProjectCustomFieldProjectMappings
     end
 
     def fetch_custom_field_ids
-      # only custom fields which are not set to required can be disabled
+      # only custom fields which are set "for all projects" can be disabled
       ProjectCustomField
         .visible(@user)
         .where(custom_field_section_id: @project_custom_field_section.id)
-        .where(is_required: false)
+        .where(is_for_all: false)
         .pluck(:id)
     end
 
diff --git a/app/services/projects/concerns/new_project_service.rb b/app/services/projects/concerns/new_project_service.rb
index 077f59abe12..bad9e78e9b6 100644
--- a/app/services/projects/concerns/new_project_service.rb
+++ b/app/services/projects/concerns/new_project_service.rb
@@ -93,7 +93,7 @@ module Projects::Concerns
       # although the user explicitly provided a blank value. In order to not patch `acts_as_customizable`
       # further, we simply identify these custom values and deactivate the custom field.
 
-      custom_field_ids = new_project.custom_values.select { |cv| cv.value.blank? && !cv.required? }.pluck(:custom_field_id)
+      custom_field_ids = new_project.custom_values.select { |cv| cv.value.blank? && !cv.is_for_all? }.pluck(:custom_field_id)
       custom_field_project_mappings = new_project.project_custom_field_project_mappings
 
       custom_field_project_mappings
@@ -104,11 +104,11 @@ module Projects::Concerns
     end
 
     def build_missing_project_custom_field_project_mappings(project)
-      # Activate all custom fields (via mapping table) that are required or
-      # have a value provided by the user, but no mapping exists.
+      # Activate all custom fields (via mapping table) that have no mapping, but are either
+      # intended for all projects, or have a value provided by the user.
 
       custom_field_ids = project.custom_values
-        .select { |cv| cv.value? || cv.required? }
+        .select { |cv| cv.value? || cv.is_for_all? }
         .pluck(:custom_field_id).uniq
       activated_custom_field_ids = project.project_custom_field_project_mappings.pluck(:custom_field_id).uniq