SAP Message AY078 - &3: You cannot change source structure &2

Diagnosis
Affected object: &V3& .
Assets under construction were already created for the object withsource structure &V2&. You cannot delete these assets underconstruction (for example, because an asset was already posted).Therefore, you cannot change source structure &V2&.

System Response
Processing is not continued.

Procedure
Use source structure &V2& (Change object: Settlement rule -->Parameters).