The BBC was found to have committed a "serious breach" of media regulations by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
Ofcom has instructed the BBC to transmit a prime-time announcement about its decisions.
"Since this amounts to a significant violation of our code, we are instructing the BBC to transmit a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Potential to Erode Credibility'
The regulator's announcement said: "Our investigation determined that the programme's omission to reveal that the narrator's male guardian held a post in the Hamas-controlled authority was materially misleading.
"This implied that the audience did not have critical information which may have been very significant to their assessment of the narrator and the information he presented.
"Trust is at the core of the connection between a broadcaster and its public, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the potential to undermine the significantly high amounts of confidence that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was pulled from iPlayer in last February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry found it breached the corporation's content policies on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are confirmed."
