The British broadcaster committed a "serious breach" of media regulations by omitting to mention that the voice of a film about the Gaza situation was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The regulator has instructed the broadcaster to transmit a prime-time declaration about its decisions.
"Since this amounts to a serious breach of our rules, we are instructing the corporation to air a message of our determinations against it on BBC Two at 21:00, with a date to be determined," the statement read.
'Risk to Erode Credibility'
The watchdog's statement declared: "The inquiry we conducted determined that the film's failure to disclose that the voice's father served in a post in the Hamas-controlled administration was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been highly relevant to their assessment of the voice and the information he shared.
"Credibility is at the heart of the bond between a television network and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to damage the significantly high levels of confidence that viewers would have placed in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from the BBC's streaming service in February after the presenter's personal associations emerged, and in July an internal BBC review found it infringed the organization's journalistic standards on truthfulness.
A corporation official commented: "The authority's determination is in accordance with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are finalised."
