Processing class

Hi Gurus,

what is Assignment to valuation basis main purpose . how to assign this for the Wage Type and how to chose its sub class between 0-5.How the salary change by choosing each sub class .can any one explain me in detail about this with an example.

1.Assignment to valuation basis

0. WT not included in the valuation basis.

1. WT included in valuation basis/001

2.WT included in valuation basis /002

3.WT included in valuation basis /001 ,/002 and /003

5.WT included in valuation basis.

Thanks in advance

Thanks & Regards.

Arun