In some cases, you might want to copy data sets to preallocated targets. However, integrated catalog facility catalogs, and system data sets that are named SYS1.* cannot be copied to preallocated data sets unless the PROCESS(SYS1) keyword is specified.

If a user wishes to upgrade or downgrade an extended format nonVSAM sequential data set you must preallocate the target data set to the extended format version number.