You can select a preference in the Preferences window - Stock view that will allow you to have the balance of the value and the on-hand quantity of stock item be less than zero. That is, you can record a transaction in MYOB Accounting that will result in negative stock.
When you choose the preference Allow the sale of items with insufficient quantities, you can record a negative stock transaction. A negative stock transaction is a transaction that would result in an item with an on-hand quantity and a total value less than zero.
Transactions that would result in an item with a negative or zero value with positive on-hand quantity or the alternative -- a positive value with a negative or zero on-hand quantity, will not be permitted.
Important:
Negative on-hand quantities can be adjusted by purchasing or building sufficient quantities of the item.
Once the adjusting transactions have been recorded, neither the transactions attached to the negative sale nor the adjusting transactions can be changed, reversed or deleted.