The British broadcaster was found to have committed a "significant breach" of media regulations by failing to disclose that the narrator of a documentary about the Gaza situation was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
Ofcom has directed the corporation to broadcast a evening announcement about its findings.
"Since this amounts to a major infringement of our rules, we are directing the BBC to air a message of our determinations against it on BBC2 at 21:00, with a date to be finalised," the regulator stated.
'Potential to Damage Trust'
The authority's announcement declared: "The inquiry we conducted found that the documentary's lack of disclosure that the presenter's male guardian occupied a post in the Hamas-controlled authority was materially misleading.
"This implied that the public did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the information he shared.
"Confidence is at the heart of the bond between a broadcaster and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to erode the exceptionally strong levels of trust that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in last February after the narrator's family links were revealed, and in July an internal BBC review determined it violated the corporation's journalistic standards on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will follow the penalty as soon as the schedule and wording are determined."
