To use a preallocated data set, you must specify the REPLACE or REPLACEUNCONDITIONAL keyword. If the REPLACE keyword is specified, the preallocated data set name must be identical to the source data set name. If the RENAMEUNCONDITIONAL(newname) and REPLACEUNCONDITIONAL keywords are specified, the preallocated data set name must match the new name filter criteria. You cannot, however, copy a data set to a preallocated target data set with the same name within an SMS environment because SMS does not support duplicate data set names.

The rules for moving VSAM and non-VSAM data sets to preallocated data sets follow.