The public service broadcaster engaged in a "major breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza situation was the son of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to factual correctness".
Ofcom has directed the corporation to air a peak-time declaration about its conclusions.
"As this represents a significant violation of our code, we are directing the broadcaster to broadcast a announcement of our findings against it on BBC Two at 21:00, with a schedule to be confirmed," it said.
'Risk to Damage Credibility'
The watchdog's announcement stated: "Our probe concluded that the film's failure to disclose that the narrator's father occupied a post in the Hamas-controlled administration was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the information he presented.
"Credibility is at the core of the bond between a media organization and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to damage the significantly high degrees of confidence that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The documentary was removed from iPlayer in the month of February after the boy's familial connections were revealed, and in this past July an broadcaster's internal assessment concluded it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official commented: "The regulator's decision is in line with the findings of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will follow the directive as soon as the timing and wording are confirmed."
