BAPI_PO_CREATE1 - not able to select existing vendor address

[jakub_glaser]

Hi
We already have a program that uses BAPI_PO_CREATE1 to copy Purchase Order. My current goal is to add additional field to be copied from the source PO to destination PO : EKKO-ADRNR.

To do that I am filling the POADDRVENDOR import structure parameter but although no error is reported, the EKKO-ADRNR field is not filed in the result PO.

PS.
When I delete POADDRVENDOR-addr_no field in this structure and run the BAPI, a new address is being created and assigned to PO.

Please advice on how to copy ekko-adrnr field to newly created PO.