The length parameter must be a numeric constant between 1 and the maximum for the type.
20
Cause . . . . . : For the PACKED and ZONED keywords, the maximum length is 63. For the BINDEC keyword, the maximum length is 9. If the parameter is a named constant or built-in function, it must be fully defined before the keyword is used. The length defaults to 1.
Recovery . . . : Correct the length parameter. Compile again.