The British broadcaster committed a "significant breach" of industry standards by omitting to mention that the voice of a film about Gaza was the son of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has instructed the broadcaster to transmit a evening declaration about its conclusions.
"Given this constitutes a major infringement of our rules, we are directing the broadcaster to air a announcement of our findings against it on the BBC's second channel at 9pm, with a date to be confirmed," the regulator stated.
'Possibility to Damage Credibility'
The authority's announcement said: "The inquiry we conducted concluded that the film's omission to reveal that the presenter's parent occupied a role in the Hamas-administered administration was materially misleading.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their evaluation of the voice and the content he provided.
"Trust is at the heart of the bond between a television network and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the possibility to erode the very considerable degrees of confidence that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The programme was pulled from iPlayer in last February after the narrator's personal associations came to light, and in the month of July an internal BBC review concluded it violated the broadcaster's content policies on truthfulness.
A representative for the broadcaster said: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will adhere to the directive as soon as the date and wording are finalised."
