As far as we know in claim processing there is no standard functionality to reverse cleared accounting document.Once the dealer is credited, and
the accounting document is cleared, it is not possible to reverse the cleared accounting documents.
Standard action A053 is use for reversal, which inturn use function module WTY03_REVERSAL_POST_XX. Instead, function module WTY03_REVERSAL_POST2_XX needs to be used which support reversal of cleared FI documents. This WTY03_REVERSAL_POST2_XX function module will try to reverse the document and if that is not possible (because it has already been cleared), it will create a new accounting document with negative sign. This solution is the standard solution of SAP warranty.