The British broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the voice of a programme about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
The authority has ordered the corporation to transmit a prime-time announcement about its findings.
"Since this amounts to a serious breach of our rules, we are directing the BBC to broadcast a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," it said.
'Possibility to Erode Credibility'
The regulator's statement declared: "Our probe determined that the documentary's omission to reveal that the presenter's male guardian served in a position in the Hamas-run authority was materially misleading.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the content he provided.
"Trust is at the center of the connection between a broadcaster and its audience, particularly for a public service broadcaster such as the BBC.
"This oversight had the risk to undermine the very considerable amounts of trust that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the BBC's streaming service in last February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment found it violated the corporation's content policies on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the authority's determination in full. We will follow the sanction as soon as the schedule and language are finalised."
