Delivery cost not created during GRN of PO using BAPI

I have a customized program which use BAPI - BAPI_PO_CREATE1 to create PO, PO was created successully.

then program will use BAPI - BAPI_PO_CHANGE to update condition pricing, which is also executed succesfully. all condition pricing (KONV) updated correctly.

Lastly, the program will use BAPI - BAPI_GOODSMVT_CREATE to create GRN and update delivery cost. However in my case, the delivery cost is not update, EKBZ table record is not created, as well as GRN item line table MSEG table is not updated with delivery cost.

Anyone face this type of problem before?What is the possible causes?

Any help and suggestion is greatly appreciated.

Edited by: Lai MJ on Jan 29, 2010 7:48 AM