A VCP could verify the value passed for the SAVE parameter of the CHGSPLFA command and force it to *NO unless FORMTYPE is equal to a particular value.
The following information is taken from the HELP screen for CRTCMD parameter VLDCKR:
Specifies the name and library of a program that performs additional user-defined validity checking on the parameters in the command being created. The same parameters that are passed to the CPP (these are identified in the PGM parameter) are also passed to the validity checking program. The validity checker performs additional user-defined validity checking beyond that specified by the command definition statements in the source file, and beyond normal control language syntax checking. More information on validity checking is in the CL Programming book, SC41-5721.
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