>It's a dBase III table the 3rd party created. The Logical fields store a 'Y' or 'N'. I guess I'll have to write a low-level function (pgm) to modify all logical fields from 'T' to 'Y' an 'F' to 'N'.
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>Ideas?

Are you 100% sure it's a logical field and not a Character 1 field? It soudns like it's a character field, which accepts Y and N.