I’m trying to understand if this plugin solves my actual problem:
I’m making a project for company witch sales houses and apartments, so I have to control sales opportunities, like this:
Building A: Apartments 1A, 1B and 1C;
Building B: Apartments: 5E, 5G and 6C.
And the system have to not permit selling same apartment twice., creating a waiting list in some step of the pipeline.