d43df8b8_ehire__or_Interagency_Transfer__then_
[If…] you are correcting the position number (POSITION) [then…] 
enter data in all three key fields on the command line: AGENCY (agency number) EMPLOYEE SSN POSITION (new or correct position number) For HØCUS Switch 1, the new hire information from HNH displays on the HMPFX screen. For HØCUS Switch 4, the HNP information displays on the HMPFX screen. If the new position number was previously assigned to the employee, then information from the previous assignment displays.
USPS Process Guide: Ch 4, HMPFX - Changing Information for a New Hire, Rehire, or Interagency Transfer
then…