We had the same issue. However, we had the <Dialog Answer> in the import scenario and were still getting the same error. What we didn’t know was identified by Naveen in the screen shot. In it he has a <Dialog Answer> BEFORE the field change (in addition to after). We added the <Dialog Answer> before the Item Class update and that resolved the error. Thank you Naveen! (Who would have thought you needed a <Dialog Answer> BEFORE and AFTER the field change).
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