Payment is done before due date

Hi,

I have a situation-vendor line item got picked in F110 before the due date. According to base line date and payment terms, it should not get picked. Everything is fine with the next payment date in F110. Please suggest on how to find out what caused the system to pick this vendor even though it is not due.

Note: When I checked BKPF table for this document, T-code is shown as MRKO (does this issue has anything to do with this T-Code?)

Thank You