If a command has positional operands, you must specify them whenever you issue the command. As the name ‘positional’ suggests, the operands must follow the command in a certain order. In the case of the RENAME command, the old data set name must be positioned first and the new data set name must be positioned second.

RENAME  old.data    new.data
        \      /    \      /
         \    /      \    /
        operand 1   operand 2