d43df8b8_ehire__or_Interagency_Transfer__then_
[If…] a correction crosses fiscal years [then…] 
you may not make the correction on the HMPFX screen. (You may make corrections by entering an additional personnel action or submitting an LOA.)
USPS Process Guide: Ch 4, HMPFX - Changing Information for a New Hire, Rehire, or Interagency Transfer
then…