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Dan, >> See? >Unfortunately, no, I don't. ... Again, what am I missing? Refer to James' and Scott's additional comments, and things should become clearer. My only nitpick with James' explanation is: > IF *IN90 is actually IF (*IN90 = '1') a true indicator field can only contain 0 or 1, but in the general sense I prefer to think of TRUE as meaning <> 0 instead of meaning = 1. In some language TRUE is stored as -1 (all bits on) and thinking of any non-zero value as TRUE tends to make rules seem more consistent across various languages. IMHO. Doug
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