In SAP documents, we can find that it is possible to post unplanned delivery costs as tax code in logistic invoices. But my problem is:
in our organization, it is used to deducting 10% of contract in service cases to examine the level of service(for example to test the quality of painting of a building) and paying 90% at the final phase and paying 10% of contract 2 months later. Now, How should I model this? I mean is it possible to consider an item as tax code while it should be deduced from and not summed with costs?