The BBC committed a "serious breach" of media regulations by not revealing that the narrator of a film about Gaza was the child of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to factual correctness".
Ofcom has instructed the BBC to transmit a evening announcement about its decisions.
"Given this constitutes a serious breach of our code, we are directing the BBC to transmit a message of our conclusions against it on BBC Two at 21:00, with a schedule to be confirmed," it said.
'Risk to Damage Trust'
The authority's announcement said: "Our investigation determined that the film's lack of disclosure that the presenter's male guardian served in a position in the Hamas-administered administration was significantly deceptive.
"Consequently that the public did not have vital facts which may have been highly relevant to their evaluation of the narrator and the information he provided.
"Credibility is at the center of the bond between a broadcaster and its audience, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to undermine the exceptionally strong degrees of credibility that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the online platform in last February after the narrator's personal associations were revealed, and in the month of July an broadcaster's internal assessment determined it breached the organization's content policies on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in complete. We will comply with the sanction as soon as the date and wording are confirmed."
