The British broadcaster committed a "serious breach" of media regulations by not revealing that the voice of a programme about the Gaza situation was the child of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The regulator has instructed the BBC to transmit a evening declaration about its decisions.
"Given this constitutes a major infringement of our rules, we are instructing the corporation to air a statement of our findings against it on the BBC's second channel at 9pm, with a date to be determined," the regulator stated.
'Potential to Damage Credibility'
The watchdog's statement declared: "The inquiry we conducted determined that the programme's failure to disclose that the presenter's male guardian served in a role in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have essential details which may have been very significant to their evaluation of the narrator and the content he shared.
"Credibility is at the center of the bond between a broadcaster and its public, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to damage the exceptionally strong levels of credibility that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in the month of February after the presenter's familial connections were revealed, and in the month of July an broadcaster's internal assessment concluded it violated the broadcaster's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects 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 adhere to the sanction as soon as the date and wording are finalised."
