As mentioned earlier
1)Can you check table V_554S_Q and check what rule has been has been assigned to your absence type.
2)Go to table T556C and check your counting rule Week day, Holiday class, day types, DWS class
and assigned Deduction rule.
3)Go to table V_556R_B and check which Quota has been assigned to deduction rule.
If everything is proper cross check your Attendance days Holiday class, Day type, DWS class with the help of work schedule rule 0007 then compare with counting rule Holiday class, Day type, DWS class
so that you can find out why it is not deducting.
Here you have a test case also in front of you open work schedule and check DWS class, Holiday class, day type of 24.01.2010,23.01.2010 etc whether same has been assigned in defined counting rule or not check it may solve your problem.
Regards
Venkatesh