The expression is not valid for assignment to built-in function %LEN.
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Cause . . . . . : The expression on the right-hand side of an assignment is not a numeric value with zero decimal positions when the target of the assignment is built-in function %LEN. The EVAL statement is ignored.
Recovery . . . : Correct the expression on the right-hand side of the assignment or change the target of the assignment. Compile again.
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