Discount amount is not getting calculated on AR Receipt

Receivable Payment Terms - 21D 3% -30Net.

Means if customer pays amount before 21 days from invoice date then he will get 3% of discount.

But while applying AR TRX to receipt, the discount amount is getting populated in "Amount Due" field instead of "Discount" field.

We do have enabled below option in "Receivables Activity" setup for "EARNED DISCOUNT" »»»» and the same is added to Receipt Class and Methods.

Any other setup or an option which im missing for earned discount calculation?

Regards,

Hemanth B.T