The British broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the narrator of a film about the Gaza situation was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
The regulator has directed the corporation to air a prime-time announcement about its findings.
"Given this constitutes a major infringement of our code, we are ordering the corporation to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Potential to Undermine Confidence'
The watchdog's statement stated: "Our probe found that the programme's omission to reveal that the presenter's parent served in a position in the Hamas-controlled administration was significantly deceptive.
"It meant that the audience did not have essential details which may have been very significant to their judgment of the narrator and the details he shared.
"Trust is at the center of the relationship between a broadcaster and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to damage the very considerable amounts of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from iPlayer in the month of February after the narrator's familial connections emerged, and in July an corporation's own inquiry determined it breached the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in its entirety. We will follow the sanction as soon as the schedule and wording are determined."
