It emerged this week that the CPS and Metropolitan Police paid compensation to the witness four years ago after the blunder during a gang violence case.
A CPS spokeswoman said that the incident "was a one-off" and that "there was no need to carry out a review into procedures".
She said: "We deal with one million cases and many involve vulnerable young people and this has not happened. This was a specific case."
But Mothers Against Murder and Aggression founder Lyn Costello said a review is needed to give potential witnesses greater confidence to testify in similar cases.
She said: "It does not matter that this was a one-off case. If it has happened once it can happen again. There needs to be a review into procedures and systems to ensure it can't. This story will have been reported and widely read by those who may be needed to come forward in cases. They need to have greater assurance that their details will be protected."
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