The public service broadcaster was found to have committed a "major breach" of broadcasting rules by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to accuracy".
Ofcom has instructed the corporation to transmit a peak-time announcement about its decisions.
"As this represents a serious breach of our code, we are instructing the corporation to transmit a announcement of our conclusions against it on BBC Two at 21:00, with a date to be determined," the regulator stated.
'Possibility to Erode Trust'
The regulator's statement declared: "The inquiry we conducted determined that the programme's omission to reveal that the presenter's father served in a post in the Hamas-run administration was materially misleading.
"It meant that the public did not have essential details which may have been very significant to their evaluation of the voice and the content he presented.
"Credibility is at the core of the connection between a television network and its viewers, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the exceptionally strong amounts of confidence that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was removed from the BBC's streaming service in last February after the presenter's family links emerged, and in the month of July an broadcaster's internal assessment determined it violated the corporation's journalistic standards on truthfulness.
A corporation official said: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will follow the sanction as soon as the schedule and wording are finalised."
