I am trying to reverse a document 1001637 in EA21 but getting the following error
Document 1001637 cannot be reversed for adjustment due to document 1001636
Message no. AH758
Document 1001637 is to undergo a special reversal. Document 1001637 already represents the new billing of document 1001636, which was reversed for adjustment. It is not possible to link adjustment reversals by means of a renewed adjustment reversal.
A normal reversal must be executed for document 1001637 - that is, an invoicing and billing reversal. If this is no longer possible, you can create a manual credit memo or backbilling.
In table ERCH the document 1001636 is being shown as reversed.
Can somebody explain me what this error message means?