After giving a nod to Ayaan Mukerji's next opposite ex-flame Ranbir Kapoor, reportedly Katrina Kaif walked out of the film as Salman Khan didn't approve of her working with the Kapoor boy.Apparently, date problems aren't the real reason as given by Katrina behind her refusal to do Ayan's film. Salman Khan may be behind her move. "Katrina was taking her time to decide on Ayaan Mukerji's because Salman had asked her to stay away from Ranbir. While she couldn't turn down her good friend Ayaan, Katrina also had to pay heed to Salman. In fact, earlier Katrina had accepted Ayaan's offer. But then she soon opted out of it," a source told Mumbai Mirror.Katrina couldn't say no to Salman who gave her the big break in B-Town. "Salman has always looked out for Katrina in the industry. He has been like a guide to her. She obviously could not just ignore his wishes when it came to Ayaan's film," added the source.Kat's friend told the tabloid: "Katrina is not doing Ayaan's film. But that's certainly not due to Salman Khan."