The BBC committed a "serious breach" of industry standards by not revealing that the narrator of a documentary about Gaza was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to broadcast a evening announcement about its decisions.
"Since this amounts to a significant violation of our code, we are ordering the BBC to transmit a message of our conclusions against it on BBC2 at 9pm, with a schedule to be determined," the regulator stated.
'Risk to Undermine Credibility'
The regulator's report said: "Our probe concluded that the film's failure to disclose that the voice's father served in a post in the Hamas-administered authority was materially misleading.
"Consequently that the public did not have vital facts which may have been very significant to their assessment of the voice and the information he provided.
"Credibility is at the heart of the bond between a media organization and its viewers, especially for a public service broadcaster such as the BBC.
"This oversight had the possibility to damage the exceptionally strong levels of credibility that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from iPlayer in February after the presenter's family links came to light, and in this past July an internal BBC review found it violated the organization's editorial guidelines on truthfulness.
A corporation official said: "The authority's determination is in line with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will follow the sanction as soon as the timing and wording are determined."
