Your routine can normalize floating-point control fields or change any other type of control field in any way that you desire. You need to be familiar with the standard data formats used by the operating system before modifying control fields.

If you want to modify the collating sequence of EBCDIC data, for example, to permit the alphabetic collating of national characters, you can do so without the need for an E61 user exit routine by using the ALTSEQ control statement (as described in ALTSEQ control statement).