The public service broadcaster was found to have committed a "major breach" of broadcasting rules by not revealing that the voice of a film about the Gaza situation was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
Ofcom has directed the corporation to broadcast a evening declaration about its findings.
"Since this amounts to a significant violation of our code, we are ordering the broadcaster to transmit a announcement of our determinations against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The watchdog's statement stated: "Our investigation determined that the programme's failure to disclose that the voice's male guardian served in a post in the Hamas-administered government was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been very significant to their evaluation of the voice and the information he presented.
"Credibility is at the heart of the bond between a media organization and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to damage the exceptionally strong levels of trust that viewers would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in the month of February after the presenter's familial connections emerged, and in this past July an internal BBC review determined it infringed the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in full. We will follow the sanction as soon as the schedule and wording are confirmed."
