The public service broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the narrator of a documentary about the Gaza situation was the son of a Hamas official, according to regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
The regulator has directed the broadcaster to air a evening announcement about its findings.
"Since this amounts to a major infringement of our code, we are directing the BBC to transmit a announcement of our determinations against it on the BBC's second channel at 21:00, with a schedule to be determined," the regulator stated.
'Possibility to Erode Trust'
The regulator's report stated: "Our investigation concluded that the documentary's failure to disclose that the voice's father occupied a position in the Hamas-controlled administration was materially misleading.
"This implied that the public did not have critical information which may have been extremely pertinent to their judgment of the presenter and the content he presented.
"Credibility is at the heart of the bond between a television network and its public, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the very considerable degrees of trust that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was removed from the BBC's streaming service in the month of February after the presenter's family links emerged, and in July an internal BBC review determined it violated the organization's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in accordance with the results 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 Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."
