The first parameter for %TLOOKUPxx is not valid.
20
Cause . . . . . : The first parameter for built-in function %TLOOKUP, %TLOOKUPGE, %TLOOKUPGT, %TLOOKUPLE, or %TLOOKUPLT 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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