You can search all the data in your KashFlow account using the global search facility. When logged into KashFlow, click the magnifying glass at the top of your menu bar, enter in your search term and hit enter.
This will search all your KashFlow details including customers, invoices, suppliers, receipts and any external references such as purchase order numbers or customer reference numbers. You can also type in an amount here; invoices or receipts of matching value will show in the results.