I can see in several reports on sales history (e.g. division sales history tab) that we have (at some point during the dev process) added the new field "Accounts Link" - so you do see it here.
But, then i think we have, in the released version failed to properly declare this field in entity ... so now
a) you can see it in the reports wherever it has been added already
b) but this column looks odd as it has no header and cannot be moved
c) if you remove this column in the report builder you cannot add it back
d) if you write a new report you cannot add this field to your report and can't therefore have a report of salestrans records with a link to open in unleashed.
This is not available in reports because it's a component rather than a field. This is something we are looking to add in the future however it requires further underlying architecture to support it.