Is the text linked to the purchase order just an information field? Could it be used for another purpose?
The text editor is just an information field when linked to the purchase order line and there is no other logic behind this functionality. The line text or the header text could be a part of the printed document. When you add text to a purchase order line you are creating a unique code that links the purchase order line (Baan - tdpur041/ LN - tdpur401) to the text (tttxt010).