The BBC engaged in a "serious breach" of media regulations by not revealing that the voice of a film about the Gaza situation was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has ordered the broadcaster to air a prime-time announcement about its decisions.
"Given this constitutes a serious breach of our regulations, we are directing the broadcaster to broadcast a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Risk to Damage Credibility'
The regulator's report said: "Our investigation concluded that the film's failure to disclose that the voice's male guardian held a role in the Hamas-administered government was materially misleading.
"This implied that the audience did not have vital facts which may have been highly relevant to their assessment of the narrator and the information he provided.
"Confidence is at the core of the relationship between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to erode the significantly high degrees of confidence that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in last February after the narrator's personal associations emerged, and in this past July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on factual correctness.
A corporation official said: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the penalty as soon as the schedule and language are confirmed."
