The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the offspring of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to air a evening declaration about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the BBC to broadcast a message of our findings against it on BBC Two at 9pm, with a date to be confirmed," the statement read.
'Possibility to Erode Credibility'
The watchdog's report said: "Our probe determined that the documentary's failure to disclose that the presenter's father served in a role in the Hamas-run authority was substantially inaccurate.
"It meant that the public did not have essential details which may have been very significant to their assessment of the presenter and the content he presented.
"Credibility is at the core of the bond between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to undermine the significantly high levels of credibility that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the online platform in the month of February after the boy's family links were revealed, and in this past July an internal BBC review determined it violated the organization's journalistic standards on accuracy.
A corporation official stated: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the schedule and wording are finalised."