The British broadcaster engaged in a "significant breach" of industry standards by failing to disclose that the voice of a programme about Gaza was the offspring of a Hamas official, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to accuracy".
Ofcom has directed the BBC to broadcast a evening statement about its conclusions.
"Given this constitutes a significant violation of our rules, we are instructing the broadcaster to transmit a announcement of our findings against it on BBC2 at 21:00, with a date to be finalised," the statement read.
'Risk to Undermine Trust'
The authority's announcement stated: "Our investigation found that the documentary's omission to reveal that the presenter's parent served in a role in the Hamas-run government was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been highly relevant to their judgment of the presenter and the details he presented.
"Confidence is at the center of the connection between a television network and its audience, particularly for a public service broadcaster such as the BBC.
"This error had the risk to erode the exceptionally strong degrees of confidence that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in the month of February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry concluded it breached the broadcaster's content policies on accuracy.
A corporation official stated: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the sanction as soon as the date and wording are finalised."
