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Sometimes when a round fails, Creo will report the following:
Recent changes have caused user-defined transition references to be lost.
Changes to either the current feature's geometry or to some other feature have caused the references for user-defined transition (No. 1) to be lost.
The affected transitions must have their references redefined.
Recommended actions: Redefine the TRANSITIONS element for the failed feature, and select the Transitions indicated above for redefinition. Reselect lost references.
In most cases there is no user defined transition, Creo has created one and it has failed. There is clearly a problem, but the error is wrong and not helpful.
I propose:
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