The British broadcaster engaged in a "serious breach" of media regulations by omitting to mention that the presenter of a programme about the Gaza situation was the son of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a prime-time declaration about its decisions.
"Given this constitutes a serious breach of our regulations, we are instructing the broadcaster to broadcast a message of our conclusions against it on BBC2 at 9pm, with a date to be finalised," it said.
'Risk to Erode Trust'
The watchdog's announcement declared: "Our probe found that the film's failure to disclose that the narrator's father served in a post in the Hamas-run authority was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the content he shared.
"Trust is at the center of the relationship between a broadcaster and its public, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to erode the exceptionally strong amounts of credibility that the public would have invested in a BBC factual programme about the Gaza conflict."
The film was pulled from iPlayer in last February after the narrator's family links came to light, and in July an corporation's own inquiry found it violated the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in full. We will comply with the directive as soon as the date and wording are finalised."
