The first parameter for %LOOKUPxx is not valid.
20
Cause . . . . . : The first parameter for built-in function %LOOKUP, %LOOKUPGE, %LOOKUPGT, %LOOKUPLE, or %LOOKUPLT must not be a special word. The built-in function is ignored.
Recovery . . . : Correct the first parameter for the built-in function. Compile again.
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