Merge in RED/persistence-service from bugfix/RED-2526 to master * commit '5d5ea1446e108fdf1953d931aa9ac2f235c7bb47': RED-2526 only one primary attribute in file-attributes
Merge in RED/persistence-service from bugfix/RED-2526 to master * commit '5d5ea1446e108fdf1953d931aa9ac2f235c7bb47': RED-2526 only one primary attribute in file-attributes