Previously, if year 2000 changes required for your files were the sort that required a simple conversion, such as a change from a 6-digit packed decimal field to an SAA date field, the CPYACTF command would do the update automatically using its *MAP support. The example command string is as follows:
CPYACTF FROMFILE(library-name/file-name) TOFILE(library-name/file-name) FMTOPT(*MAP) CMPLCK(*YES)