The BBC engaged in a "major breach" of industry standards by omitting to mention that the voice of a film about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, stating there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to broadcast a evening declaration about its findings.
"Given this constitutes a serious breach of our regulations, we are directing the corporation to transmit a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a timing to be finalised," it said.
'Possibility to Erode Confidence'
The watchdog's report stated: "The inquiry we conducted found that the film's omission to reveal that the voice's male guardian held a position in the Hamas-run government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the information he provided.
"Credibility is at the core of the relationship between a broadcaster and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the possibility to erode the significantly high levels of credibility that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from the online platform in February after the boy's personal associations emerged, and in this past July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on accuracy.
A corporation official said: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in full. We will adhere to the sanction as soon as the schedule and language are finalised."
