The British broadcaster was found to have committed a "significant breach" of media regulations by omitting to mention that the voice of a programme about the Gaza situation was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to factual correctness".
Ofcom has ordered the BBC to air a peak-time statement about its conclusions.
"As this represents a serious breach of our rules, we are directing the broadcaster to air a message of our conclusions against it on the BBC's second channel at 9pm, with a timing to be determined," the regulator stated.
'Potential to Undermine Confidence'
The regulator's statement declared: "The inquiry we conducted found that the film's omission to reveal that the voice's male guardian held a post in the Hamas-run administration was materially misleading.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their judgment of the narrator and the content he provided.
"Trust is at the core of the relationship between a media organization and its audience, especially for a national broadcasting corporation such as the BBC.
"This error had the possibility to erode the significantly high amounts of confidence that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in the month of February after the boy's familial connections emerged, and in the month of July an corporation's own inquiry determined it violated the organization's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the sanction as soon as the schedule and language are determined."
