The system’s top menu, the so-called "black bar", is equipped with a search window.
On the subpages Income and Expenses, you can find income and expenses invoices in turn. Then in the search field enter the number or part of the number of the desired invoice. When you click on the magnifying glass symbol, the program will search for all available invoices according to the selected parameters.
The search works the same way on other subpages: Clients, Products, Warehouse documents and Payments.