Is it possible to post a partial sales invoice against a fixed asset where the FA quantity = 1?

We purchased 3 items which we put together in one FA, quantity 1. But now we only sold 1 of them. Is it possible to create a partial sales invoice against this FA so that we can continue to post depreciations for the remaining 2 items?

I’m not aware of a way, but you could do a manual adjustment to the fixed asset in order to record it financially properly and get the next depreciations to calculate properly.