The public service broadcaster committed a "significant breach" of broadcasting rules by failing to disclose that the voice of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a major oversight in relation to truthfulness".
The authority has directed the BBC to broadcast a prime-time announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to air a message of our conclusions against it on BBC2 at 9pm, with a schedule to be confirmed," it said.
'Possibility to Undermine Trust'
The watchdog's announcement said: "Our investigation concluded that the documentary's omission to reveal that the presenter's parent occupied a role in the Hamas-administered government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been highly relevant to their assessment of the presenter and the information he provided.
"Trust is at the center of the bond between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the exceptionally strong degrees of confidence that viewers would have placed in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the online platform in February after the presenter's personal associations came to light, and in the month of July an corporation's own inquiry found it breached the organization's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in full. We will follow the sanction as soon as the schedule and language are finalised."
