When adding aol form custom rule, Stat allow you to add just a line of the description. Therefore, I am expecting for this line to get migrate to the target environment only instead of the whole function name.
Stat displays all of the rule descriptions so that the user knows which parent function object to select. You only need to select one rule per function because Oracle always moves all the rules associated with the function. That's part of the lct file definition. In other words, the user might know which rules they are looking for and not remember the function. If they have two rules with the same function name, they only need to add one. But on the other hand, if later, they want to see which "individual" rules they modified/archived, they can select multiple. It's just that the agent will copy the same data multiple times and it will take a little longer.
The newer R12 .lct files have an additional parameter for RULE_KEY, which you can try to add to the list of parameters. With this RULE_KEY in place, FNDLOAD will not migrate the same form function multiple times even if you add different description that belong to the same form function. Attached is the script that you can run to add RULE_KEY. Make sure to take a good back-up of your stat db just in case.