The BBC engaged in a "significant breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to factual correctness".
The regulator has directed the corporation to transmit a evening announcement about its findings.
"As this represents a major infringement of our regulations, we are ordering the corporation to broadcast a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the statement read.
'Risk to Erode Trust'
The watchdog's report said: "The inquiry we conducted concluded that the film's failure to disclose that the voice's parent served in a position in the Hamas-controlled administration was materially misleading.
"This implied that the audience did not have vital facts which may have been highly relevant to their assessment of the presenter and the details he presented.
"Credibility is at the heart of the relationship between a broadcaster and its audience, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to undermine the very considerable levels of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the boy's personal associations emerged, and in the month of July an internal BBC review determined it breached the corporation's content policies on factual correctness.
A representative for the broadcaster stated: "The authority's determination is in agreement with the findings of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the timing and wording are determined."
