Perhaps OnObjectModify on the pop up menu could be used instead of Go to object?
You can also use a validation rule to limit possible values to only those in the drop down's value list--so that may be worth a look also.
I can a like the idea validating just what it appears in the drop down's value list. Is there a function for this or a takes more to do it? Thanks
In FileMaker Pro, open Manage | Database | Relationships, find the field and open up Field Options. Limit to Value list, is an option on the validation tab.