Derivation of Transaction type during ASKB

Hi Gurus,

I have come across issue where change in Transaction type is desired for documents posted via ASKB.

Document type AZ is posted when ASKB is run. Transaction type is picked up under Additional account assignement section of Line item,

I would like to know how Transaction type is derived against GLs in line item of such documents.

How we can change the way sytem picks up particular Transaction type?

Thanks in Advance.