Hey,
does anyone know if there is any way for the requestor of a purchase requisition to be able to choose out of all the vendors for his purchase requisition lines using items?

I know that you can make several vendors selectable by either setting one in the item master, in trade agreements or item coverage or for procurement categories. However my customer needs to be able to choose out of all vendors when using items in purchase requisition lines.
That is why I'm looking for a possibility to choose out of all of them.
I would be thankful for any help.