The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a programme about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found 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 truthfulness".
Ofcom has ordered the broadcaster to transmit a evening statement about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the broadcaster to transmit a message of our conclusions against it on BBC Two at 9pm, with a schedule to be confirmed," it said.
'Risk to Undermine Confidence'
The watchdog's announcement stated: "Our investigation determined that the film's lack of disclosure that the presenter's male guardian held a role in the Hamas-controlled authority was significantly deceptive.
"Consequently that the audience did not have essential details which may have been highly relevant to their assessment of the presenter and the details he presented.
"Trust is at the heart of the relationship between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to undermine the significantly high amounts of credibility that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from the BBC's streaming service in February after the boy's personal associations came to light, and in July an internal BBC review concluded it infringed the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the sanction as soon as the timing and wording are determined."
