BAPI_PO_CHANGE to change delivery address

Hi ,

I am usinf BAPI_PO_CHANGE to change delivery address number in purchase order,

Parameters i'm passing to the BAPI are ,

PO_ITEMX-PO_ITEM = 0010

PO_ITEMX-PO_ITEMX = U

PO_ITEMX-SUPP_VENDOR = X.

PO_ADDRDELIVERY-PO_ITEM = 0010

PO_ADDRDELIVERY-ADDR_NO = 268979.

and later i'm doing COMMIT WORK and WAIT as well

but the changes are not reflected in the PO.

BAPI RETURN message sates PO has been changed but address number has not been updated in the PO.

for all the other changes , such as qty, uprice etc... chanegs are taking place properly.

is there any other parameter that has to be set, kindly let me know.

Regards,

Raghavendra