The public service broadcaster was found to have committed a "serious breach" of industry standards by omitting to mention that the narrator of a documentary about the Gaza conflict was the child of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to truthfulness".
The authority has ordered the BBC to transmit a prime-time announcement about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to broadcast a statement of our determinations against it on BBC2 at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Undermine Trust'
The authority's report said: "Our probe determined that the film's lack of disclosure that the narrator's male guardian served in a role in the Hamas-administered government was materially misleading.
"Consequently that the public did not have essential details which may have been highly relevant to their evaluation of the presenter and the details he provided.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the risk to erode the significantly high amounts of confidence that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The film was pulled from iPlayer in February after the presenter's familial connections were revealed, and in this past July an broadcaster's internal assessment found it breached the organization's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in complete. We will adhere to the directive as soon as the date and wording are determined."
