Creating this bug on behalf of rhn-support-jiwei . 

During QE testing, they noticed the following:

• When an OSD version lower than 4.13.15 is selected, the UI correctly throws the error "You must use OpenShift version 4.13.15 or above". 
• However, it let's user continue with the rest of the steps in the OSD wizard. Only after the cluster creation is submitted, the preflight check catch this error and ask user to go back and reselect an OSD version 4.13.15 or above. 
  • This is a bad user experience and we would like user to be not allowed to proceed (i.e. have the "Next" button disabled) from the "GCP Shared VPC" step in the OSD wizard when the minimum version requirement is not met.  

Please refer the attached screenshot.