The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the narrator of a film about Gaza was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The regulator has instructed the corporation to air a prime-time announcement about its conclusions.
"As this represents a major infringement of our rules, we are instructing the broadcaster to broadcast a announcement of our findings against it on the BBC's second channel at 9pm, with a date to be finalised," the statement read.
'Possibility to Undermine Trust'
The authority's report declared: "Our probe found that the programme's omission to reveal that the narrator's male guardian held a role in the Hamas-administered government was substantially inaccurate.
"It meant that the audience did not have essential details which may have been very significant to their evaluation of the narrator and the information he presented.
"Credibility is at the core of the bond between a television network and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This failing had the potential to damage the very considerable levels of credibility that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the boy's family links came to light, and in the month of July an internal BBC review found it infringed the broadcaster's journalistic standards on truthfulness.
A corporation official said: "The regulator's decision is in agreement with the results of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in full. We will adhere to the sanction as soon as the schedule and wording are determined."
