i am using 1.7.4 version and downloaded and imported all free databases. After creating some processes i now would like to create a product system and calculate the impacts. But when i try to search for providers in my model graph there is no provider i can select for any of my flows, the columns are completely blank.
I created the bottle production as example and there i can select providers in all of the flows.
Are there some flows that don't have providers? If so, does that mean that i can't use these flows for my process?