Logic of security permission.

Hello,

My understandings about the security roles was that if I have e.g. 3 role assigned to me which all contain 1 specific privilege (with VendTable) and if 2 of them has access level set as "view" on VendTable from "Override permission" form and 1 of it has access level set as "Edit", I should be able to edit the VendTable values.

But in Vendors form which database is VendTable I have only View access.

How is it possible?

Thanks,