The BBC committed a "significant breach" of broadcasting rules by omitting to mention that the narrator of a programme about Gaza was the child of a Hamas representative, as determined by regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
The authority has directed the BBC to transmit a evening declaration about its conclusions.
"Since this amounts to a significant violation of our rules, we are ordering the BBC to broadcast a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Risk to Erode Confidence'
The authority's report declared: "Our probe concluded that the programme's omission to reveal that the voice's male guardian held a role in the Hamas-run administration was substantially inaccurate.
"This implied that the public did not have essential details which may have been extremely pertinent to their evaluation of the voice and the details he provided.
"Credibility is at the core of the bond between a television network and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the exceptionally strong levels of credibility that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the BBC's streaming service in February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment concluded it breached the organization's journalistic standards on accuracy.
A corporation official stated: "The regulator's decision is in agreement with the results 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 corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the timing and wording are confirmed."
