The public service broadcaster committed a "serious breach" of broadcasting rules by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The authority has directed the broadcaster to air a peak-time declaration about its findings.
"Since this amounts to a significant violation of our code, we are directing the corporation to broadcast a message of our conclusions against it on BBC Two at 21:00, with a timing to be finalised," it said.
'Potential to Erode Credibility'
The authority's report declared: "Our investigation determined that the film's lack of disclosure that the presenter's male guardian occupied a post in the Hamas-administered government was significantly deceptive.
"Consequently that the public did not have vital facts which may have been highly relevant to their assessment of the voice and the details he provided.
"Trust is at the heart of the relationship between a broadcaster and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the very considerable amounts of credibility that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in the month of February after the narrator's familial connections emerged, and in this past July an corporation's own inquiry found it breached the corporation's journalistic standards on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the regulator's ruling in full. We will adhere to the penalty as soon as the schedule and language are finalised."
