Every once in a while, you will need to adjust the permissions (add/remove, etc) on external content types that you created. Since this isn’t done every day, it may be hard to remember exactly how it’s done. Anyway, that’s what I’ve found, personally.

So, in order to set permissions on your external content type, follow these steps:

• In Central Admin, go to Application Management
• Click on Manage Service Applications
• Click on Business Data Connectivity Service
• Check the service on which you need to change permissions
• Click on ‘Set Object Permissions’
• Add/remove permissions as necessary