The British broadcaster was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
Ofcom has directed the corporation to transmit a peak-time declaration about its decisions.
"Given this constitutes a significant violation of our rules, we are ordering the broadcaster to air a announcement of our conclusions against it on BBC Two at 9pm, with a date to be finalised," it said.
'Risk to Damage Confidence'
The watchdog's announcement stated: "Our probe concluded that the programme's failure to disclose that the presenter's male guardian held a role in the Hamas-run authority was materially misleading.
"It meant that the viewers did not have essential details which may have been highly relevant to their judgment of the narrator and the details he shared.
"Credibility is at the core of the relationship between a broadcaster and its public, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to damage the very considerable levels of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was withdrawn from the online platform in the month of February after the narrator's familial connections came to light, and in this past July an internal BBC review concluded it infringed the broadcaster's content policies on truthfulness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in complete. We will adhere to the sanction as soon as the schedule and wording are confirmed."
