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 son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to accuracy".
Ofcom has ordered the corporation to transmit a evening announcement about its findings.
"Given this constitutes a serious breach of our rules, we are ordering the broadcaster to transmit a announcement of our conclusions against it on the BBC's second channel at 9pm, with a date to be confirmed," it said.
'Risk to Erode Trust'
The regulator's announcement stated: "Our probe found that the film's failure to disclose that the voice's parent held a position in the Hamas-controlled government was materially misleading.
"This implied that the viewers 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 relationship between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This failing had the possibility to undermine the exceptionally strong levels of confidence that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was removed from iPlayer in the month of February after the boy's personal associations were revealed, and in the month of July an broadcaster's internal assessment determined it breached the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the penalty as soon as the timing and language are confirmed."
