Serial Number In the Invoice

I have trying to find where do i mark so , if an item has a serial number when issued in a invoice, the serial number is also printed. right now the serial numbers just helps for searching an item ,but when its old the serial number is not printed in the invoice. where do i set that? I found some issues around but that means to mess around with the formats. Which the code doesnt look very similar to tyhe one i have.

would also be interested in how to print S/N on invoices.

Ah, just realised that if you activate Compact Item Print under Print Preview->Settings, the S/N gets printed on the invoice.

Yup that did the trick !!! thank u for taking the time to share