The public service broadcaster committed a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a serious breach of our regulations, we are directing the BBC to transmit a message of our findings against it on BBC2 at 9pm, with a date to be confirmed," the regulator stated.
'Risk to Undermine Confidence'
The regulator's report said: "Our probe concluded that the documentary's lack of disclosure that the presenter's male guardian held a role in the Hamas-administered government was significantly deceptive.
"Consequently that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the content he presented.
"Trust is at the heart of the relationship between a television network and its audience, notably for a public service broadcaster such as the public broadcaster.
"This error had the possibility to erode the significantly high amounts of confidence that viewers would have put in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the online platform in last February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry determined it infringed the corporation's editorial guidelines on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will comply with the sanction as soon as the timing and wording are finalised."
