Hi Pratyusha,
Please maintain Table V_T510 in order to default the values in IT0008. Also make sure that the wage type which you want to default in IT0008 are with characteristic INVAL A.
If the wage type are of INVAL B, C, D, then you no need to maintain values in this table, instead you can se table V_T539J.
Hope this will help you.
Thanks & Regards
Saroj Hial