SAP Message >0155 - Document &1 generated by SD billing doc; reversal not possible

Diagnosis
The document was created in the SD component when an order wasinvoiced. You cannot reverse documents like this directly. Instead, youhave to use invoicing to create a credit memo for the same amount. Theoriginal document can then be cleared with this credit memo, or thereversal is carried out via invoicing.

System Response
Error message

Procedure
Create a credit memo for document &V1& or reverse the order invoicing.