The BBC was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza conflict was the son of a Hamas administrator, 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 head of the BBC had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to broadcast a peak-time declaration about its conclusions.
"Given this constitutes a serious breach of our code, we are directing the BBC to transmit a message of our conclusions against it on the BBC's second channel at 21:00, with a timing to be determined," the regulator stated.
'Potential to Undermine Credibility'
The authority's statement said: "The inquiry we conducted determined that the film's failure to disclose that the voice's parent occupied a position in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the narrator and the details he provided.
"Trust is at the center of the relationship between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to damage the very considerable amounts of credibility that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in February after the presenter's familial connections emerged, and in this past July an broadcaster's internal assessment found it infringed the broadcaster's content policies on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in complete. We will comply with the sanction as soon as the timing and wording are confirmed."
