سلام وقت بخیر

از متد DeletePersonById وب سرویس IPerson استفاده می کنیم ولی با خطای زیر مواجه می شویم

stdClass Object
(
    [Message] => System.Exception: The DELETE statement conflicted with the REFERENCE constraint "FK_User_Identity". The conflict occurred in database "PayamGostar2", table "dbo.User", column 'IdentityId'.
The DELETE statement conflicted with the REFERENCE constraint "FK_Identity_CrmObject". The conflict occurred in database "PayamGostar2", table "dbo.Identity", column 'Id'.
The statement has been terminated.
The statement has been terminated.
   at Septa.PayamGostar.BusinessFacadeLayer.CRM.User.CrmObjects.CrmObjectDeleter.Delete(CrmObjectEntity crmObject, CrmObjectDeleteOption deleteOption, Boolean trackChangesInDeleter)
   at Septa.PayamGostar.ServiceLayer.ServiceType.PGServiceTypes.API.Person.DeletePersonById(String username, String password, Guid personId, CrmObjectDeleteOption deleteOption)
    [Success] => 
    [CrmId] => 00000000-0000-0000-0000-000000000000
)