Cash Discount on Partial Payment Receipt F-28

Dear Support,

Thanks for the support till date.

I am facing a problem. I want to give cash discount to my customer on Partial payment received within the discounting period.

For E.g Customer's outstanding is 20000 and if he pays within 10 days he will get a cash discount of 3%. Now if he makes a partial payment of Rs 10000 within 10 days he is entitled to get the 3% discount on Rs. 10000.

I am  unable to find the CD option in the Partial Payment Tab of F-28.

Kindly suggest.

Thanks & Regards

Om Prakash Gupta