The BBC committed a "serious breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to truthfulness".
The regulator has instructed the corporation to air a prime-time announcement about its findings.
"As this represents a major infringement of our code, we are ordering the BBC to air a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The regulator's statement stated: "The inquiry we conducted concluded that the film's lack of disclosure that the voice's father occupied a position in the Hamas-controlled authority was significantly deceptive.
"This implied that the public did not have vital facts which may have been highly relevant to their assessment of the presenter and the information he provided.
"Confidence is at the center of the relationship between a media organization and its viewers, notably for a national broadcasting corporation such as the BBC.
"This error had the risk to damage the exceptionally strong levels of credibility that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from iPlayer in February after the narrator's familial connections were revealed, and in this past July an internal BBC review determined it violated the organization's content policies on factual correctness.
A BBC spokesperson commented: "The authority's determination is in accordance with the findings of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the sanction as soon as the schedule and wording are confirmed."
