The British broadcaster committed a "serious breach" of industry standards by failing to disclose that the presenter of a documentary about the Gaza situation was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The regulator has ordered the broadcaster to air a evening declaration about its conclusions.
"As this represents a significant violation of our code, we are instructing the broadcaster to broadcast a statement of our determinations against it on BBC2 at 9pm, with a timing to be confirmed," the regulator stated.
'Risk to Undermine Credibility'
The authority's statement said: "Our probe concluded that the film's omission to reveal that the voice's father held a post in the Hamas-controlled government was significantly deceptive.
"It meant that the public did not have critical information which may have been highly relevant to their assessment of the narrator and the content he provided.
"Confidence is at the center of the bond between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This error had the possibility to erode the significantly high amounts of confidence that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in last February after the presenter's family links were revealed, and in the month of July an corporation's own inquiry found it infringed the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in full. We will adhere to the penalty as soon as the date and wording are finalised."
