The BBC engaged in a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to accuracy".
The authority has directed the corporation to air a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our rules, we are instructing the broadcaster to air a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Possibility to Erode Trust'
The watchdog's report said: "Our investigation determined that the documentary's lack of disclosure that the presenter's father occupied a position in the Hamas-administered authority was materially misleading.
"It meant that the viewers did not have vital facts which may have been highly relevant to their judgment of the voice and the content he provided.
"Trust is at the center of the connection between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the potential to erode the exceptionally strong degrees of trust that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the online platform in February after the presenter's family links came to light, and in July an broadcaster's internal assessment determined it infringed the organization's content policies on truthfulness.
A BBC spokesperson said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will comply with the directive as soon as the date and wording are finalised."
