BAPI ALM ORDER MAINTAIN change settlement receiver

Hello experts!

I've written a program to create PM orders using bapi BAPI_ALM_ORDER_MAINTAIN. The initial need was to create only PM orders assigned to a WBS eleemnt, to do so this bapi worked fine.

But now, in some cases, I would like to add an account assignement category and a settlement receiver (visible in settlement rule tab of transaction IW33). My problem is that I didn't manage to do so with bapi_alm_order_maintain, there is a parameter table called srule for settlement rules but I cannot find the 2 fields I would like to work with.

Does anyone have an idea on how to process?

Thanks very much in advance!!!