What is the processing status in ANC_PER_ABS_ENTRIES table

Summary:

Hello,
We are on Oracle Fusion Cloud HCM (Absence Management) and are trying to understand the PROCESSING_STATUS column in the table ANC_PER_ABS_ENTRIES.

What we have observed:
The column holds the values E, P and R.
E: we can see this on absence entries that fail after running the Evaluate Absences process (entry in error). This matches our expectation.
P and R: we cannot work out when these are set. In our test data, entries with both P and R are a mix of Approved and Pending Approval absences, so the status doesn’t seem to follow the approval status (ABSENCE_STATUS_CD / APPROVAL_STATUS_CD).