"Value cannot be added to this row until row has been committed"

[xz]

I'm getting "value cannot be added to this new row until the row has
been committed" on a form.
But when I enter the record into the table directly, it works fine.
Anyone have any idea what is wrong.
NOTE: When I commit the row by entering it in the table directly, it
works fine. Just creating a new record in the form is causing that
error noted above. Thanks

jason shohet