The public service broadcaster committed a "serious breach" of industry standards by not revealing that the presenter of a programme about the Gaza conflict was the son of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded 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 ordered the BBC to transmit a prime-time statement about its conclusions.
"As this represents a serious breach of our rules, we are ordering the corporation to air a message of our determinations against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The authority's statement stated: "Our investigation found that the documentary's failure to disclose that the voice's male guardian served in a role in the Hamas-run administration was significantly deceptive.
"This implied that the audience did not have essential details which may have been very significant to their evaluation of the voice and the information he shared.
"Credibility is at the core of the connection between a television network and its public, especially for a national broadcasting corporation such as the BBC.
"This error had the risk to erode the very considerable degrees of trust that the public would have placed in a BBC factual programme about the conflict in Gaza."
The programme was pulled from iPlayer in last February after the narrator's familial connections emerged, and in this past July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A representative for the broadcaster said: "The regulator's decision is in line with the results of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in full. We will follow the directive as soon as the timing and wording are confirmed."
