Our old P.O.S. system had a feature where you could look up all transactions that contained a specified inventory item. The boss may ask, "can you show me the last ticket that had (x)."

You would go to that inventory item's page. Then, click a button to show a list of transactions containing the item. Or, you could go to the reports/admin area and get to the same.

Currently, Repairshopr has a functionality where it shows Purchase Orders matching that SKU. What I'm proposing would be similar, but would list tickets/invoices.