In all product types except Template, the description is a hidden field derived from /name - thus on the Products|Information screen the name and description columns are identical.

If we changed the description to be derived from /details/printedName then it would be blank for products with no printed name and present for those with a printed name.  It would thus provide quick feedback that that what will show on the invoice is different to the name.

Alternatively use the expression:

concat(/details/printedName,substring(/name,0,number(not(/details/printedName))*string-length(/name)+1)) 

which, if I got it correct shows the printedName if there is one, else the name - ie what will show on the invoice.

Personally I like the 'blank if no printedName' option.

Regards, Tim G