When selecting the type of sharing in the SCSI Bus Sharing in vSphere Web Client, the options are duplicated:
VMware vCenter Server 7.0.3
This is a known issue in vCenter Server 7.0 Update 3v
Broadcom is investigating this issue, any options in the drop-down menu can be selected.
As a workaround, you can change SCSI Bus Sharing configuration in Host Client.