Wagetype generation

Hi All,

I'm entering a wagetype (no.1943) in to Infotype 15 to make an additional payment. This wagetype 1943 is taxable and when payroll is run another wagetype (no. 5401) is generated by the system which shows how much tax is to be paid on wagetype 1943.

My question is that where in the system is this calculation happening and how is wagetype 1943 linked to wagetype 5401?

Thanks

Mike