Partial payment and interest against Loans in Treasury

Hi Folks,

I have taken loan 100,000 with 2% interest for 1 year. I want to make the payment 60,000 after 6 months.I have used product category 550.

can we make interest repayment on an ad-hoc basis? I understand we can use partial, it'll let you select frequency and if you do not put a desired amount, it will calculate equal payments based on the frequency.

but the user would like to pay as and when they have money to pay, and they want to pay only the interest.

regard