The BBC committed a "significant breach" of industry standards by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has ordered the corporation to transmit a prime-time statement about its decisions.
"Since this amounts to a major infringement of our rules, we are instructing the BBC to transmit a message of our determinations against it on BBC Two at 9pm, with a date to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The watchdog's statement said: "Our probe concluded that the film's lack of disclosure that the presenter's parent served in a post in the Hamas-run administration was substantially inaccurate.
"Consequently that the public did not have vital facts which may have been very significant to their judgment of the narrator and the details he provided.
"Trust is at the center of the bond between a television network and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high levels of confidence that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The film was removed from the BBC's streaming service in last February after the presenter's family links were revealed, and in July an corporation's own inquiry concluded it breached the corporation's content policies on truthfulness.
A BBC spokesperson stated: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in full. We will comply with the directive as soon as the schedule and language are finalised."
