Journal Lines for Period End and Accrual Reversal

Hello,
In seeded journal entry rule set for Receipt Accounting, we have only one event 'Period End Accrual'.
We do not have any other event for Accrual Reversal.

The reversals are generated by running a dedicated process. We are unable to identify the journal lines which are generated by the system.

GL user should be able identify Period End Accrual and Reversals based on Description rule.

Kindly advise how description rules can be used to differentiate these two events.