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Attribute Mapping and ItemRevision Master form strange behaviour


I have a following mapping from NX to TC


{Dataset type="UGMASTER"
 {Item type="CustItem"
   NX_Mass : ItemRevision.GRM(IMAN_master_form,CustomRevision Master).z_mass         /master=cad /allow_null_value
Mapping works fine, but I notice strange behaviour of CustomRevision Master form. When I open the IRM form and then close it - the message like "There are unsaved changes. Save changes?". But I didnt do any changes in master form.
Why this happend or what I do wrong?