The public service broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza situation was the child of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has directed the BBC to transmit a prime-time declaration about its findings.
"Since this amounts to a major infringement of our rules, we are instructing the BBC to transmit a statement of our determinations against it on the BBC's second channel at 9pm, with a schedule to be determined," it said.
'Possibility to Undermine Credibility'
The authority's statement declared: "Our probe concluded that the documentary's failure to disclose that the presenter's father held a position in the Hamas-run government was materially misleading.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their assessment of the voice and the content he presented.
"Credibility is at the heart of the relationship between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This error had the potential to erode the significantly high amounts of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was removed from iPlayer in last February after the boy's personal associations emerged, and in the month of July an internal BBC review concluded it breached the corporation's content policies on accuracy.
A corporation official commented: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in complete. We will adhere to the penalty as soon as the schedule and wording are confirmed."
