RT stores the values of different WTs for a particular month whereas CRT stores the cumulated value of WTs that has been defined in table T54C3. The cumulation may be monthly or quarterly or yearly (financial year/calendar year) or unlimited as may be defined in table T54C3.
Cumulated values are generally used for different calculations. For example, /124 and /125 stores the monthly regular and irregular salary. However, for tax purposes the cumulated values of these WTs for a financial year and the projected values of the current salary based on no of months left in the FY is used to calculate income tax.
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