The British broadcaster was found to have committed a "major breach" of industry standards by failing to disclose that the presenter of a documentary about the Gaza conflict was the offspring of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to accuracy".
Ofcom has directed the broadcaster to air a prime-time declaration about its conclusions.
"Given this constitutes a serious breach 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 schedule to be confirmed," the regulator stated.
'Possibility to Undermine Trust'
The regulator's report declared: "Our probe found that the film's failure to disclose that the presenter's male guardian occupied a position in the Hamas-run government was significantly deceptive.
"Consequently that the public did not have essential details which may have been highly relevant to their judgment of the voice and the content he provided.
"Confidence is at the center of the bond between a television network and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the possibility to damage the significantly high degrees of credibility that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from iPlayer in last February after the presenter's family links were revealed, and in the month of July an internal BBC review found it infringed the broadcaster's content policies on accuracy.
A BBC spokesperson commented: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in full. We will follow the sanction as soon as the date and language are determined."
