Hi,
One of the standard way of creating reconciliation key automatically is maintaining user id and any 3 characters in Maintain Reconciliation Groups for Default Values in SPRO (Maintain Rules for Reconciliation Key Default Values)
If above option is exercised, system will create reconciliation key for individual postings online (Mass transactions will not be processed)as below.
for e.g. in FPE1 as YYMMDD01XXX
For proposing any other values in reconciliation keys, you can customized event FKK_SAMPLE_1113_USER for both individual and mass processing transactions.
Hope this helps.
Regards,
Paresh
