The British broadcaster committed a "major breach" of media regulations by not revealing that the voice of a film about the Gaza conflict was the offspring of a Hamas official, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has directed the broadcaster to transmit a prime-time statement about its findings.
"As this represents a serious breach of our code, we are ordering the BBC to broadcast a statement of our determinations against it on BBC Two at 9pm, with a date to be determined," it said.
'Potential to Erode Trust'
The regulator's report said: "Our investigation concluded that the programme's omission to reveal that the narrator's male guardian occupied a position in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have critical information which may have been highly relevant to their assessment of the voice and the information he provided.
"Trust is at the center of the bond between a broadcaster and its viewers, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to erode the very considerable degrees of confidence that audiences would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in February after the narrator's familial connections emerged, and in this past July an internal BBC review concluded it violated the corporation's editorial guidelines on truthfulness.
A corporation official stated: "The Ofcom ruling is in line with the results of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will comply with the penalty as soon as the date and wording are confirmed."
