[RHEL7.2 Beta] Why can't user provide network repository path in Installation Source Window if booted with Red Hat Enterprise Linux 7.2 Beta boot.iso?

Issue

• [RHEL7.2 Beta] Why can't user provide network repository path in Installation Source Window if booted with Red Hat Enterprise Linux 7.2 Beta boot.iso?
• The Red Hat Enterprise Linux 7.2 Beta DVD contents are hosted using http protocol at the location http://192.168.0.254/RHEL72Beta/ , but when system is booted with Red Hat Enterprise Linux 7.2 Beta boot.iso, the probe to provide the source of installation is grayed out, why is this happening?
• Is it a bug?