The public service broadcaster engaged in a "major breach" of industry standards by failing to disclose that the voice of a programme about the Gaza situation was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The authority has ordered the corporation to broadcast a evening declaration about its findings.
"As this represents a significant violation of our rules, we are ordering the BBC to air a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Potential to Undermine Confidence'
The watchdog's report declared: "The inquiry we conducted concluded that the film's omission to reveal that the voice's father occupied a post in the Hamas-administered administration was materially misleading.
"This implied that the audience did not have essential details which may have been extremely pertinent to their assessment of the voice and the content he shared.
"Confidence is at the center of the relationship between a broadcaster and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the significantly high amounts of trust that the public would have put in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from iPlayer in last February after the presenter's familial connections emerged, and in this past July an corporation's own inquiry determined it violated the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson said: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in full. We will comply with the directive as soon as the timing and wording are determined."
