Can BAPI BAPI_PO_CHANGE update the account assignment of a PO line with GR and invoices reversed?

[fisher_li]

ABAP gurus,

I need your help. I currently use BAPI BAPI_PO_CHANGE to update purchase orders in S4. There was a case that the account assignment was successfully updated for a PO line without any goods receipt or invoices posted but the account assignment  was not updated for the PO line with GR and invoices posted even the GR and invoices were reversed. ( all total of GR and invoices are zero). I also did not get any error or warning for the PO line not updated in the return table of BAPI_PO_CHANGE. 

My co-workers also tested and confirmed that they can manually update the account assignment on a PO line after the GR and invoices were reversed.

My question is that Can I use BAPI_PO_CHANGE to update the account assignment for PO lines with GR or invoice posted and reversed?  If BAPI_PO_CHANGE can update the account assignment for PO lines with GR or invoice posted and reversed, what field(s) should I populate to force the BAPI to update the account assignment?

Thanks!

Sincerely,

Fisher Li