Is it possible to limit one sales rep / user not to see other sales rep / users’ proposals, invoices issued for the same customer. We need both of the users to see the same customer contact details and that’s all. We need that one user is not able to see other users’ requests for proposals and purc…

The only option is a custom module. Then, each page that holds this ‘sensitive info’ should be rewritten to limit the data output based on the current user ID. And this is a lot of pages. Proposal/Order/Invoice lists and cards, their appropriate tabs, Third-party cards and tabs, third-party stats, o…