If you have a 700 heading containing some subfields (d,q,r) and link to an authority not containing those fields they remain in the record after linking and when the record is saved To reproduce: Have/create a record with a 700 field containing extar subfields Link to an authority without those subfields The extra subfields remain Save the record Extra subfields are saved and things now don't match up.
Adding two possibly related bugs as see also
Closing this one in favor of bugs under omnibus bug 17908. Could be 5572/11315/14583 *** This bug has been marked as a duplicate of bug 17908 ***