Changing a balance that appears in this window
If the balance is too low, you may need to add a purchase that occurred before you began using MYOB Accounting Plus. To do this, click the Add Purchase button to display the Historical Purchase window, and use that window to enter information about the missing purchase.
If the balance shown is too high, you may have made an error when entering your purchase transactions. First click the Supplier Detail option and choose the supplier whose balance appears to be wrong. Your open (unpaid) purchases from the supplier will appear. Locate the erroneous purchase and click the zoom arrow next to it; the purchase will appear in the window where it was originally entered. Depending upon the preferences you've chosen, you can use that window either to edit the transaction or to reverse it and reenter it.