DECS, Initialize keys?

Hi !

I have created an activity in order to export documents to an sql database. The key field is the UNID.

When I “initialize keys” DECS says that this is not supported when the key field is the UNID !

It looks very odd ! I can’t be sure that any other field is unique, and I believe that the key field must be unique to make the activity working. Am i wrong ?

Should I create another field containing a copy of the UNID to make it work ?

Thanks for help !