The BBC was found to have committed a "significant breach" of industry standards by omitting to mention that the narrator of a film about the Gaza situation was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the broadcaster to transmit a peak-time declaration about its findings.
"As this represents a major infringement of our regulations, we are instructing the BBC to transmit a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be determined," it said.
'Risk to Undermine Trust'
The authority's announcement declared: "Our probe determined that the film's lack of disclosure that the presenter's father held a post in the Hamas-administered authority was significantly deceptive.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the content he presented.
"Trust is at the center of the bond between a media organization and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the potential to erode the significantly high levels of confidence that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in February after the presenter's personal associations emerged, and in the month of July an internal BBC review found it infringed the organization's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in full. We will adhere to the penalty as soon as the timing and wording are finalised."
