I use Perfex CRM, and I need to add some new little functionality,
For the beggining i will explain what i have and how i want to use it,
So i have the page items where i can add my items that i use, (image 1),
then i have in image 2 the page where i can send to my clients an offer with my selected items.
Then the client have his own page where he can accept or not the offer (image 3)
So what i need is that the selected items that are sent to a client can be sent again to other client too, but when one of them accept first the item offer the other client wont be able to accept it too and after an item is accepted then until the end date no one can use the item for another offer again!