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you do not need to set destination (in this case) an operation ON a field stays in the field unless
Once again: {Identifiers} is the FIELD
isbn is the field type.
(This is a relational DB. There are 0 to N records in the Identifiers table. 1 for each TYPE with the assigned value for EACH BOOK)
Since you are setting it to Nil, there is NO value with that name Leave that blank also
the test results look fine.
Try on a SINGLE pair of test books, If that flies, do more
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