BAPI_PO_CREATE1 - GL_ACCOUNT/WBS cleared

Hi Gurus,

i'm trying to create a PO with bapi_po_create1.

The po has 1 position with Account Assignment Category 'P', and has 1 service.

I fill the g/l account and the wbs element in table poaccount and accountx.

the system create a po without account assignment information.

At end of bapi the table poaccount has GL_ACCOUNT and WBS_ELEMENT cleared.

Please help!

Thanks in advance,

Max.