Diagnosis
You have tried to copy a settlement rule from a reference order. This,however, is not possible because the original order and the order thatis to be created have different assignments.
The only combinations that are permitted are an assignment to the samesales order or WBS element or settlement to the same material.
In general, only settlement rules that could also be createdautomatically or manually without a reference can be copied.

System Response
The settlement rule is not copied. It is created automatically.