Sec 40A - Cash Disallowance Doubt

So 10K cash paid to single person in a day is disallowed. this i know. buttttt..... is it per bill/invoice too??

suppose, i received 3 invoice from same creditor of ₹6k, 8k, 9k. If i paid them with cash in a single day. will it be disallowed or acceptable as it is per invoice??