The BBC engaged in a "significant breach" of industry standards by omitting to mention that the voice of a documentary about Gaza was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has ordered the BBC to broadcast a peak-time statement about its decisions.
"Since this amounts to a major infringement of our code, we are directing the broadcaster to transmit a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be finalised," the statement read.
'Potential to Erode Trust'
The watchdog's statement said: "Our probe found that the programme's failure to disclose that the narrator's male guardian served in a post in the Hamas-run government was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the information he presented.
"Trust is at the core of the relationship between a television network and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to erode the exceptionally strong degrees of confidence that audiences would have placed in a BBC factual programme about the Gaza conflict."
The programme was pulled from the BBC's streaming service in February after the boy's personal associations emerged, and in July an broadcaster's internal assessment concluded it infringed the corporation's content policies on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in complete. We will comply with the penalty as soon as the timing and wording are confirmed."
