The British broadcaster committed a "significant breach" of media regulations by failing to disclose that the presenter of a documentary about the Gaza conflict was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the broadcaster to air a evening declaration about its decisions.
"Since this amounts to a major infringement of our regulations, we are ordering the corporation to transmit a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Damage Credibility'
The watchdog's statement said: "Our probe found that the film's failure to disclose that the voice's male guardian served in a position in the Hamas-run authority was materially misleading.
"This implied that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the details he shared.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This error had the possibility to damage the very considerable degrees of trust that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The programme was removed from iPlayer in February after the narrator's familial connections came to light, and in July an internal BBC review determined it breached the organization's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in full. We will follow the sanction as soon as the timing and language are finalised."
