The BBC was found to have committed a "significant breach" of industry standards by not revealing that the presenter of a programme about the Gaza conflict was the child of a Hamas official, as determined by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has instructed the corporation to transmit a prime-time declaration about its decisions.
"As this represents a significant violation of our rules, we are directing the corporation to air a announcement of our findings against it on BBC2 at 9pm, with a timing to be determined," the regulator stated.
'Potential to Undermine Confidence'
The regulator's statement said: "The inquiry we conducted determined that the programme's lack of disclosure that the narrator's male guardian served in a role in the Hamas-run government was materially misleading.
"This implied that the viewers did not have vital facts which may have been highly relevant to their evaluation of the narrator and the details he shared.
"Credibility is at the heart of the bond between a television network and its public, particularly for a public service broadcaster such as the BBC.
"This error had the risk to erode the exceptionally strong degrees of credibility that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the boy's familial connections emerged, and in this past July an corporation's own inquiry determined it violated the corporation's content policies on accuracy.
A corporation official stated: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in full. We will adhere to the penalty as soon as the date and language are finalised."
