You use the XCAL option when valid exclusive references have been made between segments of an overlay program. A warning message is issued for each valid exclusive reference, but the binder marks the output module as executable.
See References between segments for information about valid exclusive references.
{XCAL | XCAL=NO | NOXCAL}
//LKED EXEC PGM=IEWBLINK,PARM='XCAL,OVLY,...'
XCAL=NO is the default value and can also be specified with the keyword NOXCAL.