Steps to reproduce:
Client has set SysConfig CLIENT_ACCOUNTING as Disabled
Material Receipts are matched to Purchase Orders > Created are not posted MatchPO records (Posted = N)
User wants to Void already matched a MR > BUG: Material receipt is not possible to Void
BUG: Problem is in MMatchPO class, method reverse. There is condition which allow to reverse only MatchPO records which are Posted and not reversed yet. But we have not Posted records because client has set CLIENT_ACCOUNTING as Disabled.
Discussed at: https://groups.google.com/forum/#!topic/idempiere/0I0r5Pqo-eE