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Steps to reproduce: - Create Synchronous sample project. - Open bpel diagram and select assign activity on it. - Go to BPEL mapper and do some changes (add one more assignment for example). - Notice that it is impossible to undo changes which were done in mapper.
the exact cause of this is known the solution is currently being debated
solution suggested by Denis Anisimov, changes have been checked into release55_dev awaiting formal review
fixed
Verified: I created several more mappings and was able to undo/redo successfully.