Accrual acounting entry in automatically created PO in shipment freight transfer process.

Dear MM Folks

I am testing a process in which PO is created automatically with document type NB and account assignment category U. Two years back when I tested this same process PO was creating service entry sheet without accounting entry but now in my new job when I configured the same scenario it is creating automatic PO and service entry sheet with accounting entry. Account entry is Freight outward Dr and GR/IR Credit. This is basically a freight service PO which is created automatically when we transfer shipment cost from VI01.

I want to know how can we create accounting entry with this automatically created PO and service entry sheet and where are the control parameters for this. What if I don't want to create entry at this time and post this freight expense at the time of MIRO? I was doing this same in my previous job but now it is behaving differently.

If you need further clarification please let me know.

Thank$