The public service broadcaster committed a "significant breach" of industry standards by omitting to mention that the narrator of a film about Gaza was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the broadcaster to air a prime-time statement about its decisions.
"Since this amounts to a serious breach of our code, we are ordering the corporation to broadcast a message of our findings against it on BBC2 at 9pm, with a schedule to be confirmed," it said.
'Potential to Damage Credibility'
The watchdog's statement stated: "The inquiry we conducted determined that the documentary's failure to disclose that the voice's parent held a position in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their evaluation of the presenter and the details he presented.
"Confidence is at the center of the bond between a media organization and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to erode the significantly high degrees of confidence that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from the online platform in February after the narrator's familial connections were revealed, and in July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on factual correctness.
A corporation official commented: "The authority's determination is in line with the findings of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the regulator's ruling in complete. We will adhere to the penalty as soon as the date and wording are finalised."
