The BBC was found to have committed a "major breach" of industry standards by not revealing that the presenter of a programme about the Gaza situation was the child of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has instructed the broadcaster to air a peak-time announcement about its decisions.
"Given this constitutes a serious breach of our regulations, we are instructing the BBC to transmit a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be determined," it said.
'Risk to Undermine Trust'
The watchdog's announcement said: "Our probe determined that the film's failure to disclose that the voice's father occupied a role in the Hamas-administered administration was significantly deceptive.
"It meant that the viewers did not have critical information which may have been very significant to their assessment of the voice and the details he shared.
"Trust is at the core of the relationship between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the possibility to damage the exceptionally strong levels of credibility that the public would have placed in a BBC factual programme about the conflict in Gaza."
The film was removed from the online platform in last February after the boy's family links came to light, and in the month of July an internal BBC review found it violated the organization's content policies on factual correctness.
A representative for the broadcaster commented: "The regulator's decision is in line with the results of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in full. We will adhere to the sanction as soon as the date and language are finalised."