Hi Rajbharti ,
Firstly , you have to check the documents related to stocks closely both in EWm and ECC system.
1 solution which i think may work is - suppose you have 100 bags in ecc and 80 bags in ewm with stock type same on both systems , do stock upload of 20 bags in ewm (check "don't post in erp" ). By doing so , the stock in ewm will be updated to 100 bags keeping the stock in ecc same . Now using /n/scwm/adhu , do internal movement to sync bin (bin whose stock is updated to zero every 10 min or so ) for 20 bags .
By doing so , the stock in both ecc as well as ewm system will show 80 bags .
Best Regards
Pratyush