This may be related to #C29HQS63G - We have a custom field on credit memos that pulls from our list of opportunities so users that create a credit memo can also select the related opportunity if applicable. We also have a custom currency field on the opportunity record. The question is, is it possible to update the custom currency field on the opportunity record when the opportunity is selected on a credit memo? i.e., the opportunity is listed on two different credit memos and it adds the total of those credit memos into the custom currency field on the opportunity

I'd probably script this for real time information as opposed to something that only shows up after the record is saved