Create a field that was removed BT125H_TASK using AET

Hello everyone.

The problem with deleting and creating a field in the component BT125H_TASK / TaskDetails. In BTACTIVITYH field has been created ZZPRODUCT using AET. For some reason, we had to delete the field using AET. Now you need to create this field again. The system does not create a field named ZZPRODUCT. The system reports axt_model 039 Id. field *** is already in use. Help me find where this field is used.

Thank you all.