The British broadcaster committed a "significant breach" of media regulations by omitting to mention that the narrator of a film about Gaza was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The regulator has directed the BBC to broadcast a prime-time announcement about its findings.
"Given this constitutes a significant violation of our regulations, we are instructing the BBC to broadcast a announcement of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be determined," it said.
'Risk to Undermine Credibility'
The authority's announcement stated: "Our investigation found that the documentary's failure to disclose that the presenter's parent served in a role in the Hamas-administered government was significantly deceptive.
"Consequently that the public did not have critical information which may have been highly relevant to their evaluation of the narrator and the information he presented.
"Confidence is at the core of the relationship between a television network and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the risk to erode the very considerable amounts of trust that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from iPlayer in February after the boy's familial connections came to light, and in this past July an corporation's own inquiry concluded it breached the broadcaster's journalistic standards on truthfulness.
A corporation official said: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in complete. We will adhere to the sanction as soon as the timing and language are finalised."
