The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the narrator of a film about Gaza was the child of a Hamas official, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to accuracy".
The authority has directed the BBC to transmit a evening declaration about its conclusions.
"Since this amounts to a significant violation of our code, we are instructing the corporation to broadcast a statement of our findings against it on BBC2 at 21:00, with a timing to be confirmed," the regulator stated.
'Possibility to Undermine Trust'
The watchdog's report said: "Our probe determined that the documentary's omission to reveal that the presenter's male guardian served in a role in the Hamas-controlled government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their evaluation of the presenter and the details he provided.
"Credibility is at the heart of the bond between a television network and its audience, particularly for a public service broadcaster such as the BBC.
"This error had the risk to damage the very considerable amounts of credibility that viewers would have put in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from the online platform in February after the narrator's family links were revealed, and in the month of July an internal BBC review concluded it breached the organization's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will comply with the sanction as soon as the date and wording are determined."
