Order or Layaway has a negative balance
This is caused by the total value of the line item(s) on the order or layaway being less than the amount of the deposit tendered, or where the items on the transaction have been voided but the deposit not refunded.
For example, a customer orders a sofa for $1,000 puts a full deposit of $1,000 down. Then changes his mind and orders a sofa worth $900. The order will show a -$100 balance until the difference is refunded.
Go into the order or layaway, select Pay and refund the monies owing.