Mistake while passing on excise

Hello All,

We are traders, we purchase material say 400 kgs from ABC (in which excise amount was Rs. 5000/-)  and sold 200 kgs to XYZ, but while preparing sales invoice we pass on whole excise amount  i.e. Rs. 5000/- instead of Rs. 2500/- . We got payment from the party.

How can I adjust this excise amount while selling remaining 200 kgs?

Please help me to solve this query at the earliest.

Thanks in advance

Smruti