CAT2 time sheet

Hi guru's,

we use cat2 time sheet to enter times on a weekly basis. is there any way that we can restrict user not to enter more than 40 hours if he uses any absence types. what I mean is if he enters time using absence type for that whole week, can we restrict him not to enter more than 40 hours for that week. we use only two absence types which will be paid, so for these absence types (say 0005 & 0010) can we check the total hours entered and restrict the user not to enter more than 40.

Any kind of suggestions are welcome and will be rewarded

cheers

SA