Do you have a layout named "LineItems"?
Not Any More !! I had an old one that was based on the old TO. I deleted same and everything works!.
Many thanks! Could not find this guidance anywhere in the Help. Odd
Actually I need to correct that : I had two layouts called LineItems one legacy ffrom teh revously deleted table. That was causing the problem.
Also changing the table name to LineItems1 changed the name of the layout automatically created to match the table to LineItems1 also -- which is why that step fixed the problem temporarily