The British broadcaster was found to have committed a "serious breach" of industry standards by omitting to mention that the voice of a programme about Gaza was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
The regulator has ordered the corporation to air a prime-time announcement about its findings.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to air a announcement of our findings against it on BBC2 at 9pm, with a timing to be determined," the regulator stated.
'Possibility to Damage Confidence'
The watchdog's statement stated: "Our investigation found that the film's lack of disclosure that the presenter's male guardian served in a position in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their evaluation of the voice and the information he provided.
"Credibility is at the heart of the relationship between a television network and its public, particularly for a national broadcasting corporation such as the BBC.
"This failing had the possibility to erode the very considerable degrees of credibility that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The film was pulled from the online platform in last February after the boy's familial connections emerged, and in July an corporation's own inquiry found it violated the organization's content policies on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will comply with the penalty as soon as the timing and wording are finalised."
