Personnel number is blank in Identification Tab of BP

Hello Everyone,

I am using FM  CRM_BUPA_CREATECENTRALPERSON and passing the BP Guid, user id. Now Userid is assigned to BP, I can see in the Identification Tab. But Personnel number is blank. How should i assign Personnel number to BP.

I tried with FM BP_BUPA_CREATECENTRALPERSON also but same result.

Thanks in advance,

Abhishek