I have altered a cell validation expression to include more criteria. The resulting expression is: =AND(OR(ISBLANK(inpNodeFlow_u1),ISBLANK(inpPtOverride_u1)),ptrPt_u1>0) When the expression evaluates to FALSE the cell still accepts an entry. Part of the expression: =OR(ISBLANK(inpNodeFlow_u1),ISBLANK(inpPtOverride_u1)) works and rejects cell entries when evaluated to FALSE. The addition of AND(......),ptrPt_u1>0) renders the cell validation non functional. I have tested each element of the expression to obtain TRUE and FALSE results so there are no problems with the range names. The cell also has condional formatting. I am using Excel 2002 on XP pro. Any clues?
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