We have a sales order type and item category which are not relevant for Billing. the process starts with sales order and ends at PGI. we post to Free of charge expense account. On the sales order we enter Cost center manually. during PGI, cost center is getting statistical posting and not actual posting. there is also a controlling document getting created during PGI.
our requirement is to have an actual posting on the cost center at the time of PGI.