/AVAILABILITY= code | CONSTANT=integer

    Specifies a license unit code that corresponds to a License Unit
    Requirement Table (LURT) or to a constant value. If your PAK
    supplies an availability code, you must enter the code exactly
    as it appears. The current codes are A, B, C, D, E, F, G, H, and
    I. If your PAK specifies the keyword CONSTANT, then you must also
    specify the integer value from your PAK. PAK issuers determine
    the value for this element.