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James,

I'm pretty sure the answer is no....

But it's easy enough to test.

Charles

On Wed, Jun 24, 2009 at 2:39 PM, James H. H. Lampert <
jamesl@xxxxxxxxxxxxxxxxx> wrote:

Suppose I have a uniquely-keyed logical with a SELECT. Case in point, a
logical, uniquely keyed on customer number, limited to records of type
"customer."

Suppose I modify this logical so that it is limited to records of type
"customer" in which the customer number field is nonblank.

Would this change cause a level-check error when an existing program
tries to open the logical?

--
JHHL
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