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In the tutorial, there is a default provider column for each input flow. However, I have not sought out any “default provider” in my open LCA that uses a free database like EF. Due to its absence, I could not find the information of the input flow within the table of “Product systems”, which is shown as follows.

So I was wondering this problem is attributed to the “free database” or other mistakes corresponding to my misconduct when inputting the input or output flows. Thanks a lot! 

in openLCA by (140 points)

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Of course,

"In the tutorial, there is a default provider column for each input flow."

This is also true for you, the column is there, but in the EF database, you typically have fully aggregated system processes which do not have (and need) connections to other processes, because they do not have waste outputs or product inputs. Since only those are shown in the model graph process box, you see only one flow, e.g. a product on the output side, in these cases.

Hope this helps!

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