The British broadcaster engaged in a "significant breach" of industry standards by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The head of the BBC had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to broadcast a peak-time declaration about its conclusions.
"As this represents a significant violation of our code, we are ordering the BBC to transmit a announcement of our findings against it on BBC Two at 21:00, with a date to be determined," the statement read.
'Possibility to Erode Confidence'
The watchdog's statement declared: "The inquiry we conducted found that the documentary's omission to reveal that the narrator's parent held a post in the Hamas-administered authority was substantially inaccurate.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the information he presented.
"Confidence is at the center of the relationship between a television network and its viewers, especially for a state-funded media outlet such as the BBC.
"This error had the potential to erode the very considerable degrees of credibility that the public would have put in a BBC factual programme about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in the month of February after the presenter's family links came to light, and in this past July an broadcaster's internal assessment found it violated the organization's journalistic standards on truthfulness.
A corporation official commented: "The Ofcom ruling is in accordance with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the regulator's ruling in full. We will follow the sanction as soon as the schedule and wording are determined."
