Thank you for your reply. Yes, I am currently working only with ecoinvent and I was thinking about the same approach as you suggested but I assume there will still be a gap in the analysis.
If we purchase another database, which we are considering for the near future, is it possible to merge them in openLCA, I mean units processes mainly? How long time would it consume, based on your experience, to merge e.g. GaBi (for construction products) and ecoinvent?