The British broadcaster engaged in a "serious breach" of industry standards by failing to disclose that the presenter of a documentary about Gaza was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the corporation to broadcast a prime-time declaration about its decisions.
"Given this constitutes a serious breach of our rules, we are directing the BBC to air a message of our findings against it on BBC Two at 21:00, with a schedule to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The watchdog's report stated: "Our probe found that the film's omission to reveal that the voice's parent occupied a post in the Hamas-administered administration was significantly deceptive.
"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 provided.
"Trust is at the core of the relationship between a broadcaster and its public, particularly for a national broadcasting corporation such as the BBC.
"This failing had the possibility to damage the very considerable levels of trust that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from iPlayer in February after the presenter's familial connections came to light, and in this past July an internal BBC review determined it violated the broadcaster's journalistic standards on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will follow the sanction as soon as the date and wording are finalised."
