The British broadcaster engaged in a "significant breach" of media regulations by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has directed the corporation to transmit a prime-time statement about its conclusions.
"Given this constitutes a serious breach of our regulations, we are ordering the corporation to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be finalised," it said.
'Potential to Undermine Trust'
The regulator's report said: "Our investigation concluded that the programme's lack of disclosure that the presenter's male guardian served in a post in the Hamas-administered authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their evaluation of the voice and the details he provided.
"Confidence is at the core of the connection between a television network and its public, particularly for a state-funded media outlet such as the BBC.
"This error had the possibility to damage the significantly high degrees of trust that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was removed from iPlayer in February after the presenter's familial connections came to light, and in the month of July an broadcaster's internal assessment concluded it breached the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in full. We will adhere to the sanction as soon as the schedule and language are confirmed."
