Table V_001P_D for Absence types grouping i.e it is for 2001 absence types
Table V_001P_I for absence quota types i.e it is for 2006 Absence quotas
Absence quotas are used show the quota accrual details where Absence types are used to show the availed leaves and Quota and absence type can be connected through counting rule and deduction rules.
Regards
Venkatesh