SAP Message AH771 - Doc. no. &4 does not correspond to doc. no. &3 in billing order

Diagnosis
Billing document &v4& is not marked as "reversed for adjustment" in thebilling order for installation &v1& with scheduled billing date &v2&.
Billing document number &v3& appears in the billing order as reversedfor adjustment. Document &v4& can therefore not be deleted from thisbilling order.

System Response