The public service broadcaster committed a "significant breach" of media regulations by omitting to mention that the presenter of a documentary about the Gaza conflict was the child of a Hamas official, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to truthfulness".
The regulator has ordered the BBC to transmit a prime-time announcement about its findings.
"As this represents a major infringement of our code, we are directing the corporation to broadcast a announcement of our conclusions against it on the BBC's second channel at 21:00, with a date to be determined," the statement read.
'Potential to Undermine Confidence'
The regulator's statement said: "The inquiry we conducted found that the documentary's omission to reveal that the narrator's father held a post in the Hamas-run authority was substantially inaccurate.
"Consequently that the public did not have critical information which may have been highly relevant to their judgment of the narrator and the information he provided.
"Credibility is at the center of the relationship between a broadcaster and its viewers, notably for a state-funded media outlet such as the public broadcaster.
"This error had the potential to erode the significantly high degrees of trust that audiences would have placed in a BBC factual programme about the Gaza conflict."
The film was withdrawn from the online platform in last February after the presenter's familial connections came to light, and in the month of July an corporation's own inquiry determined it violated the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will follow the directive as soon as the timing and wording are confirmed."
