The British broadcaster committed a "serious breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the child of a Hamas representative, according to regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a prime-time statement about its conclusions.
"Since this amounts to a significant violation of our code, we are directing the corporation to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be finalised," the statement read.
'Potential to Erode Confidence'
The watchdog's statement declared: "Our probe found that the documentary's lack of disclosure that the narrator's father occupied a post in the Hamas-run authority was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the details he provided.
"Trust is at the core of the connection between a broadcaster and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to erode the exceptionally strong amounts of confidence that audiences would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the presenter's personal associations were revealed, and in this past July an corporation's own inquiry determined it breached the broadcaster's editorial guidelines on accuracy.
A corporation official stated: "The authority's determination is in agreement with the results of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will adhere to the sanction as soon as the schedule and wording are finalised."
