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 conflict was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the corporation to air a prime-time announcement about its decisions.
"Given this constitutes a major infringement of our rules, we are directing the corporation to air a message of our determinations against it on BBC Two at 9pm, with a timing to be confirmed," it said.
'Potential to Undermine Trust'
The authority's announcement declared: "Our probe found that the film's lack of disclosure that the presenter's father occupied a post in the Hamas-run authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the content he provided.
"Confidence is at the heart of the relationship between a television network and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the exceptionally strong degrees of credibility that audiences would have put in a BBC factual programme about the Gaza conflict."
The film was pulled from the online platform in last February after the presenter's family links emerged, and in the month of July an internal BBC review concluded it infringed the corporation's content policies on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the sanction as soon as the schedule and wording are confirmed."
