Ok, I've made the revisions and came up with the attached design.
This works but adding a ContractNumer is a bit cluncky.
Since PK for ContractT is the ContractID (autonumber), if I add a duplicate ContractNumber, it generates another ContractID. Not what I want.
So, converted the ContractNumber text box into a combo box and added a List Items Edit Form.
Now the user can either select an existing ContractNumber from the dropdown or enter a new ContractNumber via the edit form.
Does anyone have a better way of doing this?
I was hoping to add a ContractNumber without the edit form but, since the combo is bound to the ID and the ContractNumber, Access won't let me.
I could have changed the bound column to the ContractNumber, but I think there is a chance that a ContractNumber could be repeated in the distant future.
Does my design, look solid so far?
Thanks for any advice.