Kohli met Anushka at M Chinnaswamy Stadium stands during the rain-break of the RCB's match against Delhi Daredevils on Sunday. Kohli was seen interacting with Anushka, who was standing in the VIP enclosure which is adjacent to the players' dressing room.
The precise code that Kohli was found to have breached relates to the minimum standards for Players and Match Officials Area (PMOA).
The exact code Kohli broke was 5.1.2(c) which reads: "Whilst outside of the PMOA, the Player, Player Support Personnel or Match Official must only communicate with those third parties with whom he/she has permission to communicate and only engage in such communications as are necessary for the completion of such purposes as have been approved."
The PMOA is monitored by the ICC's Anti-Corruption and Security Unit, which has been contracted to provide anti-corruption cover during the IPL.