Assigning records to teams

Another relationship question (I think).

What I’m trying to model with my graph:

There will be different teams that will be selling the same products to different customers, and possibly at different prices. Customers can be put into groups, but it’s not mandatory. Here is a simplified ER Diagram:

The red represents entities will be “owned” by one team and will never change teams. The green represents entities that will also be owned by one team, but could possibly change teams.

I don’t want teams to be able to see any of the other teams’ records. I think I want everyone to share a product list. Prices (and costs) will depend on which team invoices the item.

I’m mostly struggling with how to relate teams and team members to the rest of the graph.

I was also thinking of putting a field called TeamsID in every record of every "owned" entity and using accounts and privileges to determine which records the current "logged in team" could see.

It's weird because it's almost like having several separate databases in one database.

Any comments or suggestions would be greatly appreciated!

Thanks,

Will