When you click on the Customers tab by the name is a column called
Sales Invoices among others where you can see the number of invoices issued to a customer and click to see a list of Sales invoices issued to the customer, I suggest for the expansion of this to include Sales Quotes, Sales Orders, Credit notes ,Debit notes and Delivery notes. This way we can easily search and access all vouchers raised for a particular customer at one place.
This can be copied for Suppliers, where we would be able to see columns like Goods receipt notes, purchase orders, Debit notes … all in the same place.
Also it could be copied to Employees where
Payslips column will appear to see the number of payslips generated for each Employee and clickable to see the list of payslips for them and view or edit or search for a transaction.