The British broadcaster committed a "significant breach" of media regulations by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the corporation to transmit a peak-time statement about its findings.
"As this represents a significant violation of our regulations, we are directing the BBC to air a announcement of our determinations against it on BBC Two at 21:00, with a date to be finalised," the regulator stated.
'Possibility to Undermine Confidence'
The watchdog's announcement said: "The inquiry we conducted determined that the programme's lack of disclosure that the narrator's parent occupied a position in the Hamas-administered authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their judgment of the voice and the information he shared.
"Trust is at the core of the connection between a media organization and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the exceptionally strong amounts of trust that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from iPlayer in February after the narrator's familial connections were revealed, and in the month of July an internal BBC review found it violated the corporation's content policies on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in full. We will follow the penalty as soon as the timing and wording are finalised."
