On some invoices in Invoice History Inquiry, the Extended Item Description is not coming over from Purchase Order Entry

Just as the subject says - Some invoices don't allow you to click on the little button to view the Extended Item Description. I can't seem to find anything in common on the invoices where the button is grayed out on Invoice History Inquiry to view the Extended Item Description.

Is anyone able to tell me why this happens or if it's an issue that I need to discuss with Sage Support/Sage Consultant?

Thank you!