The British broadcaster was found to have committed a "major breach" of industry standards by failing to disclose that the voice of a film about the Gaza conflict was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
The authority has directed the broadcaster to broadcast a evening declaration about its findings.
"Since this amounts to a significant violation of our code, we are directing the broadcaster to broadcast a message of our determinations against it on BBC Two at 9pm, with a date to be finalised," the regulator stated.
'Potential to Undermine Confidence'
The watchdog's report declared: "Our probe concluded that the documentary's omission to reveal that the voice's father served in a post in the Hamas-administered administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their evaluation of the voice and the details he shared.
"Trust is at the heart of the relationship between a broadcaster and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the risk to erode the significantly high levels of credibility that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in February after the presenter's personal associations were revealed, and in July an internal BBC review determined it infringed the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the regulator's ruling in full. We will adhere to the penalty as soon as the timing and language are finalised."
