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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?
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JHHL
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