3 years later and no solution from QB on this!!!! WOW!! Glad we're switching systems this year! 

Just wanted to add our internal fix for this, not the ideal fix but worked for now. We added the SKU# for all products to the item description so now it prints the sku on all forms along with the description. You'll have to unclick SKU# on the invoice form or any other form it's selected on so you don't have duplicate SKU#'s listed.