Costing SLA for same event class triggered by different sources

Summary:

We have Event Class: Acquisition Cost Adjustment that triggers for different scenarios, identified on Create Accounting Execution Report as 'Source'

Content (please ensure you mask any confidential information):

So far, we have identified 3 sources that are triggering the Event Class: Acquisition Cost Adjustment and Event Type is either Acquisition Cost Adjustment or Acquisition Cost Write-off.

3 Sources:

1. Accrual Clearing
2. Retroactive Price Adjustment (triggered when some changes are made to PO Price)
3. AP Invoice Adjustment (seen when Conversion Rate and Date on PO and Invoice are different causing the adjustment to trigger)

What we are looking for is to see how we can identify each of the above source when we write conditions in our Account Segment Rule in Cost Management so that the accounting can be derived correctly for each of the above source. E.g. Client wants the Retroactive Price to go to a PPV account but Accrual to a different account.