The public service broadcaster engaged in a "major breach" of industry standards by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has directed the BBC to transmit a peak-time declaration about its conclusions.
"Since this amounts to a major infringement of our regulations, we are instructing the BBC to broadcast a announcement of our determinations against it on BBC2 at 21:00, with a schedule to be finalised," it said.
'Possibility to Damage Confidence'
The regulator's report said: "Our investigation determined that the documentary's lack of disclosure that the voice's parent served in a post in the Hamas-administered administration was significantly deceptive.
"Consequently that the public did not have vital facts which may have been very significant to their evaluation of the voice and the information he shared.
"Confidence is at the center of the connection between a television network and its viewers, notably for a national broadcasting corporation such as the BBC.
"This error had the potential to damage the very considerable levels of trust that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the boy's personal associations came to light, and in this past July an internal BBC review found it infringed the corporation's journalistic standards on truthfulness.
A BBC spokesperson stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the directive as soon as the schedule and language are confirmed."
