Hi guys -
After I did some change to the input form template, found, the Edit Report option is grayed out. Also, at the same time, I noticed the Default Report from the Report Connections is missed if compared with the original version one which still visible - (please find the attachments for your reference).
Apparently, ALL the other BPC templates are working fine apart from the one I did some changes recently. I have tried all kind solutions until re-install the EPM application but the result still the same
.
Since the changes have took me one working day so I am really hoping that someone have the similar problem and it have been resolved before.
Thank in advance for your all help. 
!
Thanks,
Hardip