The public service broadcaster committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a film about Gaza was the offspring of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the broadcaster to broadcast a prime-time declaration about its findings.
"Since this amounts to a significant violation of our regulations, we are ordering the broadcaster to transmit a statement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be determined," the regulator stated.
'Potential to Damage Confidence'
The regulator's statement said: "The inquiry we conducted concluded that the documentary's failure to disclose that the narrator's male guardian held a role in the Hamas-administered administration was materially misleading.
"This implied that the public did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the details he provided.
"Trust is at the center of the connection between a broadcaster and its audience, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to undermine the significantly high amounts of trust that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from the online platform in last February after the narrator's personal associations emerged, and in this past July an internal BBC review found it breached the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in full. We will comply with the sanction as soon as the date and language are determined."
