error mes cannot post into blank space on one side of outer join

[John thomas]

I am using a combo box
and i am getting the following eror mesage
cannot enter value into blank space on one side of outer join
I have a customers table that i am tryingto input there names into anorders table .

 

[John Big Booty]

If you are trying to add items to your combo list, this sample may be of interest to you.