The BBC was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza conflict was the son of a Hamas administrator, according to regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has ordered the corporation to air a evening announcement about its conclusions.
"Given this constitutes a major infringement of our regulations, we are ordering the broadcaster to air a message of our findings against it on BBC2 at 21:00, with a timing to be determined," it said.
'Possibility to Undermine Trust'
The watchdog's announcement said: "Our investigation concluded that the documentary's failure to disclose that the narrator's parent occupied a position in the Hamas-administered administration was significantly deceptive.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the narrator and the details he presented.
"Trust is at the core of the relationship between a media organization and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to damage the significantly high amounts of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from iPlayer in the month of February after the boy's personal associations emerged, and in July an broadcaster's internal assessment concluded it violated the corporation's content policies on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in line with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will adhere to the sanction as soon as the date and wording are confirmed."
