How to change Quota deduction to 3 decimals

Question

Our Quota deductions was set-up for 2 decimals, back in 2000, and we have a request to change it to 3 decimals for a Personel Area.
I've looked over the Time Management section of the IMG and looked over the Absence Counting (Rounding Rules, Counting Rules) and the Managing Time Accounts using Attendance/Absence Quotas (Quota Types, Deduction Rules) nodes, but I can't find where to set-up the decimals for Quota deductions.
Our IT2006 shows 5 decimals (but the last 3 are always zeros), but the Quota Used field on IT2001 (Q2000-ANZHL) only has 2 decimals.

Answer 1

Thanks Mahesh and Joker, 
I'll try to create such a rounding rule, but it doesn't seem that this would be where to set the number of decimals since the rounding rules all have 5 decimals.
Currently, none of our Counting Rules (T556C) are linked to a Rounding Rule (V_T559R).
Thanks Dilek,
I do not need to change the parameters of field Q2000-ANZHL, as long as the calculation uses 3 decimals.
For example, a part-time employee who works a regular shift of 3.00 hours per day will have Full Time Equivalent of 37.5%.
When he is absent, his Quota should be reduced by 0.375 days, and not 0.38 or 0.37 days.  This exactitude is required since the same employee can change FTE a few times over the year, depending on the needs and the budgets.