The British broadcaster was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the narrator of a programme about the Gaza situation was the son of a Hamas official, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the corporation to transmit a evening declaration about its decisions.
"Since this amounts to a major infringement of our regulations, we are directing the corporation to broadcast a announcement of our findings against it on BBC Two at 21:00, with a timing to be confirmed," the statement read.
'Potential to Erode Confidence'
The authority's report said: "Our probe concluded that the programme's failure to disclose that the voice's male guardian served in a post in the Hamas-run government was substantially inaccurate.
"This implied that the public did not have vital facts which may have been highly relevant to their evaluation of the narrator and the content he provided.
"Credibility is at the core of the connection between a media organization and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the possibility to undermine the exceptionally strong degrees of confidence that the public would have placed in a BBC factual programme about the Gaza conflict."
The documentary was pulled from the online platform in last February after the presenter's family links came to light, and in the month of July an internal BBC review concluded it breached the corporation's journalistic standards on truthfulness.
A BBC spokesperson stated: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the authority's determination in its entirety. We will follow the directive as soon as the date and language are finalised."
