Hi Yang,
you need to get the payments made for 07 period in 08 period let us say the amount paid was v_08 and for 07 in 07 period say v_07. get the variance i.e ( v_08 - v_07 ) which is v_variance. Then read the payment of 08 in 08 period let us say v_payment.
Total payment made in the 08 period for a specific wagetype was v_payment + v_variance.
Thanks,
Narendra.
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