The public service broadcaster committed a "serious breach" of media regulations by failing to disclose that the voice of a film about the Gaza situation was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The authority has directed the BBC to transmit a evening declaration about its conclusions.
"As this represents a significant violation of our rules, we are directing the corporation to air a message of our determinations against it on BBC2 at 21:00, with a schedule to be determined," it said.
'Possibility to Damage Trust'
The regulator's statement declared: "Our probe determined that the programme's omission to reveal that the narrator's male guardian occupied a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their judgment of the presenter and the content he shared.
"Credibility is at the core of the bond between a media organization and its public, notably for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to erode the very considerable degrees of credibility that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The programme was removed from iPlayer in last February after the boy's family links were revealed, and in July an internal BBC review determined it infringed the corporation's journalistic standards on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in full. We will comply with the directive as soon as the timing and language are confirmed."
