The public service broadcaster was found to have committed a "significant breach" of media regulations by omitting to mention that the narrator of a programme about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had previously apologised, noting there had been "a significant failing in relation to truthfulness".
The regulator has instructed the BBC to transmit a evening announcement about its findings.
"As this represents a significant violation of our regulations, we are instructing the broadcaster to broadcast a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Risk to Undermine Trust'
The authority's statement declared: "The inquiry we conducted found that the film's lack of disclosure that the narrator's male guardian held a role in the Hamas-run government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their assessment of the presenter and the information he provided.
"Credibility is at the core of the relationship between a broadcaster and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the exceptionally strong degrees of confidence that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from the online platform in the month of February after the narrator's family links came to light, and in the month of July an internal BBC review concluded it infringed the organization's content policies on factual correctness.
A BBC spokesperson said: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and wording are confirmed."
