The public service broadcaster committed a "serious breach" of media regulations by omitting to mention that the narrator of a film about Gaza was the child of a Hamas official, according to UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a major oversight in relation to accuracy".
The authority has directed the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a significant violation of our code, we are directing the corporation to air a message of our conclusions against it on the BBC's second channel at 9pm, with a timing to be finalised," it said.
'Possibility to Erode Trust'
The watchdog's statement said: "The inquiry we conducted determined that the film's omission to reveal that the presenter's father occupied a role in the Hamas-controlled authority was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been highly relevant to their judgment of the narrator and the details he shared.
"Confidence is at the center of the connection between a television network and its public, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to erode the exceptionally strong degrees of trust that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in last February after the boy's personal associations were revealed, and in July an broadcaster's internal assessment determined it violated the organization's content policies on truthfulness.
A corporation official stated: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the sanction as soon as the date and wording are determined."
