Working Week in IT 0007

Hi Gurus,

From Earlier Threads i could understand that "Working Week" in IT 0007 serves as start point and end point of the week to determine weekly overtime. but what iam creating in table T559A is Just text. how does system understand ?

For example:

i have created the following entry in T559A

Mon - Sat     7 Days

how does system get to know, the week starts from "Mon" and ends at "Sat" since its just the text.

Thanks.