If you are planning to make some modifications in your pricing calculation schema (transaction M/08), you should make sure that these changes do not lead to inconsistencies in purchasing documents that have already been created before the customizing is changed.
It is important that during this modification, the step and counter from already existing conditions are not changed, otherweise you might get error messages during goods receipt, invoicing and reversing already existing documents.
To achieve this you can:
- Create a new calculation schema. Here you will play on the safe side. If you have to make many changes, this might be the most reasonable choice.
- Change or add conditions to the actual calculation schema. In this case you have to make sure that you do not change the step and counter from already existing conditions.
Taking one of the above options, you should not get into trouble.