The BBC was found to have committed a "significant breach" of industry standards by not revealing that the presenter of a documentary about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our code, we are directing the broadcaster to transmit a message of our findings against it on the BBC's second channel at 9pm, with a schedule to be finalised," it said.
'Potential to Erode Credibility'
The authority's statement said: "The inquiry we conducted concluded that the film's failure to disclose that the voice's father served in a role in the Hamas-run administration was significantly deceptive.
"This implied that the audience did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the content he presented.
"Confidence is at the heart of the bond between a media organization and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the very considerable degrees of trust that viewers would have put in a BBC factual programme about the Gaza conflict."
The film was withdrawn from the online platform in the month of February after the boy's familial connections were revealed, and in the month of July an internal BBC review found it violated the organization's content policies on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of the internal assessment, 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 expressed regret for this and we agree with the authority's determination in full. We will adhere to the directive as soon as the schedule and wording are finalised."
