I have discovered that if you have a record that is in multiple OAI Sets you cannot use the same MARC tag for mapping them. Thus, if you have two sets with mapping as 590a is equal to TOM 590a is equal to MARY And a record with ... 590a TOM 590a MARY ... This record will be in the OAI set "TOM" and it will NOT be in the set "MARY". If you switch the order of the 590a so that ... 590a MARY 590a TOM ... Then the record will be in the OAI set "MARY" but not in "TOM". Because the "map reader" stops after the first mapping match. I consider this a bug. It should read all of the 590a tags and map each one that is a match. Don't forget that the MARC tag used in OAI mapping must be an indexed tag. BTW: This is Koha V3.16.02.000 Steve sowder@andrews.edu