In this activity, you can decide whether you want to use the substitute field SKAT-MCODF for the G/L account long text or for the G/L account short text.
Since the search fields for the G/L account long text (SKAT-TXT50) and for the short text (SKAT-TXT20) are case sensitive, a special substitute field was created for these fields. All entries in the search field belonging to the substitute are automatically converted to capital letters in the substitute field (SKAT-MCODF). Therefore when entering the G/L account long or short text in the matchcode selection, you do not have to worry about making lowercase or uppercase entries.
The G/L account long text (SKAT-TXT50) is already entered as a search field in the standard SAP software. In the standard matchcodes, the substitute field SKAT-MCODF is entered instead of the SKAT-TXT50 field.
If possible you should avoid making any changes to the standard system. If you want to change the preset search field SKAT-TXT50 to SKAT-TXT20, then you also have to adjust the standard matchcode IDs.
For further information see the documentation for the activity "Maintain Matchcodes for G/L Accounts" .