The installation has the option of allowing DFSMShsm to expire data sets based on an explicit expiration date found to be invalid because the current Management Class definition does not permit explicit expiration dates. You can use the following PATCH command to request that DFSMShsm honor an explicit expiration date, even if the current Management Class definition specifies a RETENTION LIMIT value of zero. By default, this type of invalid expiration date is ignored.

PATCH .MCVT.+1B5 BITS(.....1..)