I am new to OpenLCA. I tried defining a new process using the EF database available for free in the OpenLCA Nexus, however I wish to calculate the impact using the CML-IA baseline method from the OpenLCA LCIA methods database. I tried importing the whole OpenLCA LCIA methods into the EF database, however, when I tried the impact analysis, the results are all zero and I found that the processes in the EF database uses different elementary flows than the ones defined for CML-IA (i.e. EF uses carbon dioxide (fossil) while CML-IA uses carbon dioxide, fossil). What can I do about this?