Can not auto import Purchase Order with Oracle AP 11.5.7 pre

I run purchasing1157.intoOA.PO:receivePO autoMode=TRUE.
I got the concProgMsg/REQUEST_ID that mean I had run import PO process.
And I got errorsDoc/ERROR_MESSAGE=LINE TYPE ID (VALUE =1) specified is inactive or invalid.
If I setup autoMode=FALSE then I use Oracle ERP user interface to import the PO successfully.

Why I can import successfully with Oracle ERP UI ?
Why can not import successfully with webMethods Oracle adapter predefined transaction service ?

Would any one tell me how to solve it ASAP.