The BBC was found to have committed a "significant breach" of industry standards by not revealing that the presenter of a film about the Gaza situation was the child of a Hamas representative, as ruled by regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The regulator has ordered the BBC to broadcast a evening declaration about its conclusions.
"Given this constitutes a serious breach of our code, we are ordering the corporation to air a message of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," the statement read.
'Risk to Undermine Trust'
The authority's statement stated: "Our probe determined that the film's omission to reveal that the voice's male guardian held a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Credibility is at the center of the relationship between a media organization and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the possibility to erode the very considerable amounts of confidence that the public would have put in a BBC factual programme about the conflict in Gaza."
The programme was removed from iPlayer in the month of February after the narrator's personal associations came to light, and in this past July an corporation's own inquiry found it infringed the corporation's journalistic standards on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the results of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the regulator's ruling in full. We will adhere to the sanction as soon as the schedule and wording are determined."
