The BBC was found to have committed a "major breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza situation was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to factual correctness".
Ofcom has directed the broadcaster to broadcast a prime-time announcement about its conclusions.
"Since this amounts to a serious breach of our rules, we are directing the corporation to air a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be finalised," it said.
'Possibility to Damage Confidence'
The watchdog's announcement declared: "Our investigation found that the programme's omission to reveal that the voice's father occupied a position in the Hamas-run authority was materially misleading.
"This implied that the public did not have vital facts which may have been highly relevant to their judgment of the voice and the information he presented.
"Credibility is at the center of the bond between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This failing had the risk to undermine the very considerable levels of credibility that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The film was removed from iPlayer in last February after the boy's familial connections emerged, and in July an internal BBC review determined it infringed the broadcaster's journalistic standards on factual correctness.
A corporation official stated: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in full. We will follow the penalty as soon as the timing and wording are finalised."
