Customer credit process

Hi,

We're in search of a new process to handle the incorrect invoicing of customers via a service order.

This is the scenario:

We have a service order for the unplanned maintenance of a vehicle. There's cost on the order. We run DP90 and generate the Debit memo request and following that we run VF04/01 and generate the billing document (debit memo). We also run settlement for the order.

At this point we realise that the sold-to-party is wrong. This happens very seldom when the master data of the vehicle has not been kept up to date. DP90 is run en-masse (DP95) and once in a while the wrong customer is being debited. Normally what we do in this situation is to credit the customer via a credit note (CR) and manually create a DR for the correct customer. However this process as you can see is a bit flaky...

What's the proper way of doing this? We need to invoice the correct customer for that service order. We can't re-run DP90 as the order has no more billable items.

There must be a standard process of doing this. Does anyone have any experience in this area?

Thanks in advance

Michalis