The British broadcaster engaged in a "serious breach" of media regulations by omitting to mention that the voice of a programme about Gaza was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the BBC to air a peak-time statement about its decisions.
"As this represents a major infringement of our rules, we are directing the broadcaster to broadcast a statement of our conclusions against it on the BBC's second channel at 9pm, with a timing to be determined," it said.
'Potential to Erode Credibility'
The authority's statement said: "Our investigation found that the documentary's omission to reveal that the narrator's father held a post in the Hamas-run authority was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their judgment of the presenter and the details he shared.
"Credibility is at the center of the relationship between a television network and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to undermine the very considerable amounts of trust that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's familial connections were revealed, and in July an broadcaster's internal assessment concluded it violated the broadcaster's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the authority's determination in full. We will follow the sanction as soon as the date and wording are determined."
