The BBC committed a "major breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza conflict was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The regulator has ordered the BBC to transmit a evening announcement about its findings.
"Given this constitutes a serious breach of our rules, we are ordering the BBC to broadcast a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," it said.
'Possibility to Erode Credibility'
The watchdog's statement said: "Our investigation found that the film's failure to disclose that the presenter's male guardian occupied a post in the Hamas-run government was significantly deceptive.
"This implied that the public did not have essential details which may have been extremely pertinent to their evaluation of the voice and the details he provided.
"Credibility is at the heart of the relationship between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This error had the risk to undermine the exceptionally strong levels of confidence that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in February after the boy's personal associations came to light, and in this past July an internal BBC review concluded it infringed the organization's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are confirmed."
