The public service broadcaster committed a "serious breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the BBC to transmit a prime-time statement about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to transmit a announcement of our findings against it on BBC Two at 21:00, with a timing to be confirmed," it said.
'Potential to Undermine Confidence'
The watchdog's announcement declared: "The inquiry we conducted determined that the documentary's failure to disclose that the voice's father occupied a role in the Hamas-controlled government was substantially inaccurate.
"It meant that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the details he presented.
"Trust is at the core of the connection between a broadcaster and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to erode the significantly high levels of confidence that viewers would have put in a BBC factual programme about the Gaza conflict."
The programme was pulled from the online platform in February after the boy's family links emerged, and in this past July an internal BBC review found it breached the organization's content policies on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in line with the results of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the regulator's ruling in full. We will adhere to the penalty as soon as the date and wording are finalised."
