How to change CheckNum for an Payment Instrument Entry which is not Posted?

Hi,
We are trying to post a Payment Instrument and get an error stating that the Paymnt Number already exists. When we checked, the CheckNum is already in use for another Payment Instrument Entry.
How can we update the CheckNum of the new Payment Instrument entry so that we cann post it?

Thanks.

@Sherlin Support can get you a datafix to make the check number 0 so you can update it.

Thank you @gpayne