The BBC was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has ordered the corporation to air a prime-time declaration about its findings.
"Given this constitutes a significant violation of our regulations, we are ordering the corporation to air a message of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be determined," it said.
'Risk to Damage Credibility'
The regulator's report stated: "Our probe found that the documentary's lack of disclosure that the voice's male guardian served in a position in the Hamas-administered authority was significantly deceptive.
"Consequently that the public did not have critical information which may have been very significant to their judgment of the narrator and the content he provided.
"Credibility is at the core of the connection between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to erode the very considerable degrees of confidence that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from the online platform in last February after the boy's familial connections emerged, and in the month of July an corporation's own inquiry concluded it infringed the corporation's content policies on truthfulness.
A corporation official commented: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the date and language are confirmed."
