The British broadcaster engaged in a "significant breach" of industry standards by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the broadcaster to air a prime-time statement about its conclusions.
"Given this constitutes a major infringement of our regulations, we are ordering the corporation to transmit a statement of our conclusions against it on BBC2 at 21:00, with a date to be determined," it said.
'Possibility to Erode Confidence'
The authority's statement said: "Our probe found that the programme's omission to reveal that the narrator's male guardian held a position in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been very significant to their judgment of the presenter and the details he presented.
"Credibility is at the core of the connection between a broadcaster and its public, particularly for a state-funded media outlet such as the BBC.
"This failing had the possibility to damage the significantly high levels of confidence that the public would have placed in a BBC factual programme about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the narrator's familial connections came to light, and in the month of July an internal BBC review concluded it violated the broadcaster's journalistic standards on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in complete. We will comply with the penalty as soon as the timing and wording are finalised."
