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hello,
I am using open lca 1.4 software with uslci database to calculate the life cycle impact of a product.
then why are some elementary flows those are used as input/output in the development of the process are disappeared?

thanks for helping.

Do you mean: why these elementary flows do not appear in the model graph? They are not shown since the model graph has the purpose to show the connection of processes via products (and to allow the user to modify and expand these); elementary flows are not useful in this context since they cannot link processes, therefore they are not shown. If you open a process however from the model graph, then you will see that the elementary flows are still there.
Hth,
Andreas

Thank you aciroth,for your help.