Deletion Indicator field not getting updated

For 2LIS_02_ITM, the LOEKZ  field for a PO having process key =1,is not getting populated for the reverse image whereas its populating for after image at the ODS level where the process key is changing from 1 to 2.

1 )  Is it correct if the del indicator "L" populates for the after image instead of the reverse  image?

2)   How does the process key changes once it is deleted in the R3 side from 1 to 2.