Reconciling 2 bank payments

Hi, 

recently struggling with staffing and under a bit of pressure I short paid a customer by $1000 but remitted the full amount to the supplier. 

I made a balance bank transfer to the supplier but now have two bank transactions against one remittance. Myob seems to not like this and I can't reverse or delete the payment in myob, nor can I reconcile in Bank feeds. I would be grateful for any help.