The commodity codes to which you want to import idents data must have a "dummy" geometrics series assigned so that each combination of commodity code and size 1 – size 5 remains unique. If you have set the project default parameter ZI_OII_S80 to ‘N’, it is not necessary to set up a geometric series this way; however, the mentioned combination still has to be unique in your import data and in Smart Reference Data; otherwise, the software rejects the import record.