The BBC committed a "major breach" of broadcasting rules by not revealing that the presenter of a programme about Gaza was the offspring of a Hamas representative, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
The authority has directed the BBC to broadcast a peak-time statement about its conclusions.
"As this represents a serious breach of our rules, we are directing the broadcaster to broadcast a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Possibility to Undermine Trust'
The authority's statement declared: "The inquiry we conducted found that the programme's lack of disclosure that the voice's father held a position in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have vital facts which may have been highly relevant to their evaluation of the presenter and the details he provided.
"Confidence is at the heart of the bond between a broadcaster and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to damage the significantly high levels of confidence that audiences would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from the online platform in the month of February after the presenter's familial connections emerged, and in July an broadcaster's internal assessment concluded it infringed the corporation's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in agreement with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and wording are confirmed."
