diff --git a/addons/userrights/userrightsprofile.db.class.inc.php b/addons/userrights/userrightsprofile.db.class.inc.php
index 58bdda6de..40bd6ba39 100644
--- a/addons/userrights/userrightsprofile.db.class.inc.php
+++ b/addons/userrights/userrightsprofile.db.class.inc.php
@@ -430,7 +430,7 @@ class URP_ActionGrant extends UserRightsBaseClass
 		//MetaModel::Init_InheritAttributes();
 
 		// Common to all grant classes (could be factorized by class inheritence, but this has to be benchmarked)
-		MetaModel::Init_AddAttribute(new AttributeExternalKey("profileid", array("targetclass"=>"URP_Profiles", "jointype"=> "", "allowed_values"=>null, "sql"=>"profileid", "is_null_allowed"=>false, "on_target_delete"=>DEL_MANUAL, "depends_on"=>array())));
+		MetaModel::Init_AddAttribute(new AttributeExternalKey("profileid", array("targetclass"=>"URP_Profiles", "jointype"=> "", "allowed_values"=>null, "sql"=>"profileid", "is_null_allowed"=>false, "on_target_delete"=>DEL_SILENT, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeExternalField("profile", array("allowed_values"=>null, "extkey_attcode"=> 'profileid', "target_attcode"=>"name")));
 		MetaModel::Init_AddAttribute(new AttributeClass("class", array("class_category"=>"", "more_values"=>"", "sql"=>"class", "default_value"=>null, "is_null_allowed"=>false, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeEnum("permission", array("allowed_values"=>new ValueSetEnum('yes,no'), "sql"=>"permission", "default_value"=>"yes", "is_null_allowed"=>false, "depends_on"=>array())));
@@ -467,7 +467,7 @@ class URP_StimulusGrant extends UserRightsBaseClass
 		//MetaModel::Init_InheritAttributes();
 
 		// Common to all grant classes (could be factorized by class inheritence, but this has to be benchmarked)
-		MetaModel::Init_AddAttribute(new AttributeExternalKey("profileid", array("targetclass"=>"URP_Profiles", "jointype"=> "", "allowed_values"=>null, "sql"=>"profileid", "is_null_allowed"=>false, "on_target_delete"=>DEL_MANUAL, "depends_on"=>array())));
+		MetaModel::Init_AddAttribute(new AttributeExternalKey("profileid", array("targetclass"=>"URP_Profiles", "jointype"=> "", "allowed_values"=>null, "sql"=>"profileid", "is_null_allowed"=>false, "on_target_delete"=>DEL_SILENT, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeExternalField("profile", array("allowed_values"=>null, "extkey_attcode"=> 'profileid', "target_attcode"=>"name")));
 		MetaModel::Init_AddAttribute(new AttributeClass("class", array("class_category"=>"", "more_values"=>"", "sql"=>"class", "default_value"=>null, "is_null_allowed"=>false, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeEnum("permission", array("allowed_values"=>new ValueSetEnum('yes,no'), "sql"=>"permission", "default_value"=>"yes", "is_null_allowed"=>false, "depends_on"=>array())));
@@ -503,7 +503,7 @@ class URP_AttributeGrant extends UserRightsBaseClass
 		MetaModel::Init_Params($aParams);
 		//MetaModel::Init_InheritAttributes();
 
-		MetaModel::Init_AddAttribute(new AttributeExternalKey("actiongrantid", array("targetclass"=>"URP_ActionGrant", "jointype"=> "", "allowed_values"=>null, "sql"=>"actiongrantid", "is_null_allowed"=>false, "on_target_delete"=>DEL_MANUAL, "depends_on"=>array())));
+		MetaModel::Init_AddAttribute(new AttributeExternalKey("actiongrantid", array("targetclass"=>"URP_ActionGrant", "jointype"=> "", "allowed_values"=>null, "sql"=>"actiongrantid", "is_null_allowed"=>false, "on_target_delete"=>DEL_SILENT, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeString("attcode", array("allowed_values"=>null, "sql"=>"attcode", "default_value"=>null, "is_null_allowed"=>false, "depends_on"=>array())));
 
 		// Display lists