This can also happen if you import external data using the wrong import method. If you are bringing in CVA data using the template the software spits out for paper and pencil studies, you'll need to make sure you are using the "Paper and Pencil data" import option, not "Import study data files" or "Merge external data". "Import study data files" assumes you are bringing in data you downloaded from a server, collected in CAPI, etc., which would already have the CVA Design ID in the file. Since it's already there, there's no need to create it again. "Merge external data" similarly assumes you're bringing in additional data to an already complete respondent record, so no reason to create it again. "Paper and Pencil data" is the only option that assumes you are simply bringing in conjoint answers, so it adds the rest of the required fields when it creates each data record.