The public service broadcaster was found to have committed a "major breach" of media regulations by not revealing that the narrator of a programme about Gaza was the child of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The regulator has ordered the broadcaster to broadcast a prime-time declaration about its decisions.
"As this represents a significant violation of our rules, we are instructing the BBC to air a message of our findings against it on the BBC's second channel at 9pm, with a timing to be determined," the statement read.
'Potential to Erode Confidence'
The watchdog's report declared: "The inquiry we conducted determined that the film's failure to disclose that the voice's father occupied a position in the Hamas-controlled government was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the narrator and the details he provided.
"Credibility is at the heart of the bond between a media organization and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to erode the exceptionally strong degrees of trust that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the online platform in the month of February after the narrator's familial connections came to light, and in the month of July an internal BBC review concluded it violated the broadcaster's journalistic standards on truthfulness.
A corporation official commented: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a significant failing in the programme 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 agree with the regulator's ruling in full. We will adhere to the penalty as soon as the date and wording are confirmed."
