The BBC engaged in a "major breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to accuracy".
The authority has ordered the corporation to broadcast a peak-time announcement about its decisions.
"Given this constitutes a significant violation of our code, we are directing the BBC to broadcast a message of our findings against it on BBC2 at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Undermine Trust'
The watchdog's report said: "The inquiry we conducted determined that the film's omission to reveal that the voice's parent held a post in the Hamas-run administration was significantly deceptive.
"This implied that the audience did not have vital facts which may have been highly relevant to their judgment of the presenter and the content he provided.
"Trust is at the core of the connection between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This error had the possibility to undermine the very considerable amounts of trust that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from iPlayer in February after the boy's family links came to light, and in the month of July an broadcaster's internal assessment determined it violated the organization's content policies on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the directive as soon as the date and wording are confirmed."
