RE: Printing multiple invoices at once
What field are you filtering on? It works if you use the No. field as a filter where you would enter multiple invoice numbers separated by the | symbol, and the other field filters are left blank.

Of course you can simply select the invoices you would like to print, and then click print and this will print all the invoices you have selected. For example, if you select two invoices as per the below, the system would print those two
