When you reverse a document, the system checks whether there are dispute cases that contain items from this document. If this is the case, the reversal has an effect on these dispute cases.
You are reversing the document with the usual reversal transaction.
For each line item in a dispute case, if you carry out a reversal in the dispute case, the original disputed amount and the disputed amount are reduced by the amount of the line item and the line item itself is classified as a resolved object and marked as reversed.