How to void partially paid bill?

How to void partially paid bill?

Hello. I have following problem and can't figure out how to solve it.

I created a bill from vendor for 180gbp for purchase of some items. It was partially paid (60gbp) and so far so good - 120gbp overdue and items were successfully added to inventory in Zoho Books. However, the parcel was lost and therefore I got refunded those 60gbp later on. But I can't find an option to void the bill (without deleting it) and record refund against the amount already paid.

Am I missing something, or would the only option be to uncategorise payment I made originally, delete bill and then use manual journals to account payment made against refund recieved?