IDOC DESADV DELVRY01 confirmation in PO

Hi everyone,

Please help me with such problem,

My system receives from vendor inbound - IDOC DESADV.DELVRY01.Process code DELS.

All works fine after I have received it. I see in PO on confirmation tab after AB confirmation my LA confirmation, but why this IDOC creates also inbound delivery document which I can see in column Inb.Deliv., because my requirement just to add line LA by IDOC and not to create Inbound delivery document ? And why also in column creation is 2 and not 3 (EDI)? Because with hands I can do through me22n LA line without inbound delivery. How to do it with IDOC?