The BBC committed a "major breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to truthfulness".
The regulator has ordered the corporation to transmit a evening declaration about its conclusions.
"As this represents a significant violation of our code, we are instructing the broadcaster to broadcast a statement of our findings against it on BBC2 at 9pm, with a date to be finalised," it said.
'Risk to Undermine Trust'
The regulator's statement declared: "Our investigation concluded that the documentary's failure to disclose that the presenter's male guardian served in a role in the Hamas-administered authority was materially misleading.
"This implied that the public did not have critical information which may have been highly relevant to their assessment of the narrator and the content he provided.
"Confidence is at the center of the bond between a media organization and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to damage the exceptionally strong amounts of trust that the public would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was removed from iPlayer in February after the presenter's personal associations came to light, and in July an internal BBC review found it violated the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the authority's determination in its entirety. We will adhere to the sanction as soon as the date and wording are finalised."
