Chinese Foreign Minister Wang Yi, Indian envoy to China Vijay Gokhale along with the ambassadors of Pakistan Masood Khalid and other SCO members attended the function. Both Indian and Pakistani diplomats pointed out the faux pas to the organisers.
SCO officials were apologetic about the gaffe, saying that they failed to cross check the photos on display as this was the first event involving India and Pakistan.
On Thursday, the SCO headquarters will raise the flags of India and Pakistan and Mr Gokhale and Mr Khalid will beat a drum, heralding the entry of their countries into the organisation.
The group is now comprised of China, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, Uzbekistan, India and Pakistan.
Afghanistan, Belarus, Iran and Mongolia have an observer status in the grouping that is increasingly seen as a counterweight to NATO.