The public service broadcaster was found to have committed a "significant breach" of media regulations by not revealing that the narrator of a documentary about the Gaza situation was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to transmit a prime-time statement about its conclusions.
"As this represents a major infringement of our code, we are directing the corporation to broadcast a statement of our conclusions against it on BBC2 at 21:00, with a schedule to be finalised," the regulator stated.
'Possibility to Erode Confidence'
The authority's statement stated: "The inquiry we conducted determined that the film's lack of disclosure that the narrator's father held a post in the Hamas-controlled government was materially misleading.
"This implied that the viewers did not have essential details which may have been very significant to their evaluation of the voice and the information he presented.
"Trust is at the heart of the relationship between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the exceptionally strong amounts of trust that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the online platform in the month of February after the boy's family links emerged, and in July an internal BBC review found it violated the corporation's content policies on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept the regulator's ruling in its entirety. We will adhere to the sanction as soon as the schedule and wording are determined."
