The BBC engaged in a "serious breach" of media regulations by not revealing that the narrator of a film about the Gaza situation was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found 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".
The authority has directed the BBC to broadcast a evening announcement about its conclusions.
"Given this constitutes a major infringement of our code, we are directing the BBC to broadcast a statement of our conclusions against it on the BBC's second channel at 9pm, with a date to be confirmed," the statement read.
'Potential to Erode Trust'
The authority's statement declared: "The inquiry we conducted determined that the film's failure to disclose that the voice's male guardian served in a position in the Hamas-administered government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the details he shared.
"Confidence is at the core of the relationship between a television network and its audience, particularly for a national broadcasting corporation such as the BBC.
"This failing had the potential to erode the significantly high amounts of trust that the public would have placed in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in this past July an internal BBC review found it infringed the broadcaster's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will follow the sanction as soon as the date and wording are confirmed."
