PLUS-1031: BO not working for non numeric container

https://catissueplus.atlassian.net/browse/PLUS-1031: BO not working for
non numeric container position during specimen upload
PLUS-1030: Inappropriate error message while loading samples via BO

https://catissueplus.atlassian.net/browse/PLUS-1030: Inappropriate error
message while loading samples via BO