How to reverse Discount

Hi,

Invoice amount - 10000

I have made payment to vendor with discount. Now i would like to revert to discount to vendor.

Followings steps have followed while making payment to vendor with discount.

1. Go to Entry -> Payments (quick Payments)

Resptive fileds has been entered on payment workbech and

2. Click on Enter / Adjustment invoice button on payment workbench

3. Payment made to vendor 4000 remaining amount 60000 as discount.

4. Accountig done

5. Discount amount has flown to Discount account.

Now i would like to return back to vendor due to some reaons. Please let us know how to achieve without payment void(cancellation).

Regards,