To be able to print Customer ID on printed Invoices
1. Navigate to Customization > Forms > Transaction Forms > Edit/Customize the form you are using.
2. Once you are on the Custom Transaction Form page> go to Printing Fields tab > Header subtab > Acct. No. is the Customer ID. Mark the Acct. No. checkbox under the PRINT/EMAIL Column.
3. Click Save button.
The Customer ID will now show on the PDF file for Invoices.
Note: Printing Fields tab will only be available if the Printing Type is set to Basic