The British broadcaster was found to have committed a "major breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to factual correctness".
The authority has ordered the corporation to air a evening announcement about its conclusions.
"Since this amounts to a serious breach of our code, we are directing the corporation to transmit a statement of our conclusions against it on BBC Two at 21:00, with a date to be determined," the regulator stated.
'Potential to Erode Trust'
The regulator's statement declared: "Our investigation found that the film's lack of disclosure that the voice's male guardian held a post in the Hamas-controlled government was substantially inaccurate.
"This implied that the public did not have critical information which may have been highly relevant to their evaluation of the voice and the information he presented.
"Credibility is at the center of the relationship between a television network and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to erode the exceptionally strong degrees of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from the online platform in February after the presenter's personal associations were revealed, and in this past July an corporation's own inquiry determined it breached the corporation's journalistic standards on truthfulness.
A corporation official said: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will adhere to the directive as soon as the timing and wording are confirmed."
