d43df8b8_ehire__or_Interagency_Transfer__then_
[If…] you are correcting information other than the employment date (ASSIGN DT) or position number (POSITION) [then…] 
the current HNP row and HNH row is updated. For HØCUS Switch 1, corrections to the actual information (such as job class or salary rate) changes the HNP budgeted information. For HØCUS Switch 4, the value entered in the UPDATE HNP BUDGET W/ACTUALS field (Y for yes; N for no) determines whether the budget and actuals match or whether an underfill or overfill situation exists.
USPS Process Guide: Ch 4, HMPFX - Changing Information for a New Hire, Rehire, or Interagency Transfer
then…