The BBC was found to have committed a "serious breach" of industry standards by not revealing that the narrator of a documentary about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
The authority has instructed the BBC to transmit a evening statement about its conclusions.
"Since this amounts to a serious breach of our rules, we are ordering the broadcaster to broadcast a message of our conclusions against it on BBC2 at 9pm, with a schedule to be confirmed," the regulator stated.
'Potential to Erode Confidence'
The regulator's announcement stated: "Our probe determined that the film's lack of disclosure that the voice's father held a position in the Hamas-administered authority was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been very significant to their evaluation of the voice and the information he shared.
"Credibility is at the heart of the relationship between a broadcaster and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the risk to damage the very considerable amounts of trust that the public would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from the online platform in February after the boy's family links came to light, and in this past July an internal BBC review found it infringed the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in complete. We will adhere to the penalty as soon as the date and language are finalised."
