Can I put a constraint on a creation ( or modification I guess) of a row based on two fields. So I want to ever only have a singular row which has the same values in these two fields.
In my case one is a lookup field, the other a choice fields. Essentially a customer and a year.
Your are only allowed to create one report for each customer per year.
Business rules seem focused on the entity itself, and not on what exists in the table already.
