<< WAIT A MINUTE! One little problem. Although the insert worked, it put a ZERO in the field, not a null. And in my case, zero is not the same as a null .... >> SET ZERO OFF before the INSERT.
If you need to preserve the previous setting do this:
SET VAR vSaveZero = (CVAL('ZERO'))
SET ZERO OFF
INSERT . . .
SET ZERO &vSaveZero
CLEAR VAR vSaveZero
--
Larry

