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The current mapper does not allow to map more than one entity to a single node in the right tree. However, it is possible to do from the source view. At the same time it does not make much sense -- the order in which <copy>s are executed is not defined. Validation engine could issue a warning or an error for this case.
Created attachment 61561 [details] Test project
fixed: b61000c960e4, d81023f2941e, 7b34d441c38a
I weaken condition to strengthen warning. Now only To expressions are compared. So warning should appear when there are to copy, which assign a value to the same target element, regardless of the source of these assignments. The changeset is here: http://hg.netbeans.org/soa-dev/rev/c88c300600a4
related issue http://www.netbeans.org/issues/show_bug.cgi?id=161827