We resolved the issue using a result on this answer. Essentially we joined the two linking fields together into a new temporary field using eval, with a delimiter between the two, and then used makemv to put those two fields back into a single multi value field (splitting over the delimiter we picked). This meant we had all the 'joining' or 'chaining' fields in a single field value, so we could simply run the transaction command over that field. There may be other or better ways to do this. I was wondering about a new command, like transaction, but which takes multiple fields. This made me read the doc for the transaction command again and it looks like it does take multiple fields. In fact, in reading the answer that I link to, I see there's an update that specifies just this. Probably a change to the transaction command in the past fixed this. Perhaps this wasn't an issue after all, and this 'solution' is overkill. ... View more