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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?

Thank you!

in openLCA by (120 points)

2 Answers

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by (22.9k points)
edited by

Hi Pascal, does this help? https://ask.openlca.org/585/what-is-provider-linking-when-creating-a-new-product-system?show=585#q585


To make sure you link processes, use product flows in the Inputs/Outputs list that are a product of processes in your database. To check this, open the General information tab of a flow (double-click on a flow to get there) and unfold the section Used in processes. If a flow has a provider, the provider (producing process) will be listed here. To be sure to set the links correctly, define the default provider for flows in the Provider column of a process and select Link default provider during the product system creation.


Btw. you should be careful with combining databases (if you did so).

by (120 points)
thank you for your fast answer.
it's good to know but still doesn't solve my problem. The "Provider" list in my input flows is empty.
Yes i combined them but is that the reason for my missing providers?
Do i now have to search flows with providers or is there a other solution?
by (22.9k points)
I updated my answer. I hope it helps. Best, Jonas
0 votes
by (120 points)
thanks a lot! it's a fast way to check if the flow got an provider.
I solved my problem by deleting all flows without a provider and selecting flows that got some.
Took me a few hours but for me it seemed to be the only way to get a correct product system.
Best, Pascal