I am in currently trying to do a Set Field from a field in Table A to the same name field in Table B. When I debug the script, nothing happens at the Set Field step. There is data in the field in Table A, and the types are the same. The tables are related also.

How can I accomplish this?

It should be working.

Note, however, that when working through a relationship like this, only the *first* related record can be seen. I'll bet that there are more than one records in Table B that are related to the one in Table A.

Table B only has one record, used just for viewing of a major change, before actually saving the change into Table A. At the beginning of this script, I am setting the serial number field in Table B to the same serial number of the current record in Table A.