The BBC committed a "serious breach" of industry standards by not revealing that the voice of a documentary about the Gaza situation was the offspring of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to factual correctness".
The authority has ordered the BBC to transmit a peak-time statement about its findings.
"Given this constitutes a serious breach of our rules, we are directing the BBC to broadcast a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Possibility to Undermine Credibility'
The regulator's announcement said: "Our probe found that the film's omission to reveal that the voice's father held a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the information he shared.
"Credibility is at the core of the connection between a broadcaster and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the risk to damage the very considerable levels of credibility that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in last February after the narrator's familial connections emerged, and in this past July an corporation's own inquiry concluded it violated the organization's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the authority's determination in its entirety. We will adhere to the penalty as soon as the timing and language are finalised."
