The BBC was found to have committed a "significant breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
The regulator has directed the broadcaster to air a peak-time statement about its conclusions.
"As this represents a serious breach of our regulations, we are directing the BBC to air a statement of our findings against it on BBC Two at 21:00, with a timing to be finalised," it said.
'Possibility to Undermine Credibility'
The authority's report declared: "Our probe determined that the documentary's omission to reveal that the voice's parent held a post in the Hamas-administered government was significantly deceptive.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the voice and the content he shared.
"Trust is at the core of the bond between a media organization and its audience, particularly for a public service broadcaster such as the BBC.
"This failing had the possibility to damage the exceptionally strong levels of credibility that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the BBC's streaming service in February after the presenter's familial connections were revealed, and in the month of July an broadcaster's internal assessment determined it violated the broadcaster's content policies on truthfulness.
A corporation official commented: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in complete. We will follow the penalty as soon as the schedule and wording are confirmed."
