The public service broadcaster committed a "serious breach" of broadcasting rules by failing to disclose that the narrator of a documentary about the Gaza conflict was the child of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to accuracy".
The regulator has ordered the broadcaster to air a evening declaration about its findings.
"As this represents a serious breach of our regulations, we are instructing the broadcaster to transmit a statement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," the statement read.
'Potential to Undermine Credibility'
The watchdog's report said: "The inquiry we conducted found that the programme's failure to disclose that the voice's father occupied a role in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he provided.
"Confidence is at the heart of the bond between a broadcaster and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to erode the exceptionally strong amounts of trust that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in February after the narrator's personal associations were revealed, and in July an corporation's own inquiry found it violated the corporation's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in full. We will adhere to the sanction as soon as the date and wording are confirmed."
