When you click on a zoom arrow next to a transaction, you're able to view the transaction in the window in which it was created. Some transactions, though, have no zoom arrow because the original transaction can't be displayed.
Here are reasons why a transaction would have no zoom arrow:
That is, a zoom arrow won't appear if the date entered in the Dated From field is a pre-conversion, pre-fiscal year or pre-purge date.
In addition, for inventory journal transactions only:
In order for a zoom arrow to appear next to an inventory journal transaction, the transaction must have been entered using version 3. (Inventory transactions are those that are assigned an IJ journal number.)
In MYOB software previous to version 3, inventory transactions could only be viewed in the Transaction Journal window. Zoom arrows aren't available for those inventory journal transactions.