Actually I am not clear which issue you mentioned here :-? It's a bit confused 
In standard after you maintain in IT0045, SAP automatically update into IT0078, so maybe your screen is IT78, just saving it, dont skip.
Any plz re-check your configuration in
| Payroll: International | |
| Loans | |
| Customer Pay Types |
Set Up Customer Payment Types
Assignment of Wage Types to Payment Types