The BBC committed a "major breach" of industry standards by failing to disclose that the voice of a film about Gaza was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has directed the BBC to broadcast a prime-time statement about its decisions.
"Given this constitutes a major infringement of our regulations, we are ordering the broadcaster to air a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," the statement read.
'Potential to Erode Confidence'
The authority's report stated: "Our investigation found that the film's lack of disclosure that the voice's father occupied a position in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have essential details which may have been very significant to their evaluation of the presenter and the details he shared.
"Confidence is at the center of the bond between a broadcaster and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to erode the significantly high levels of credibility that the public would have put in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from the online platform in the month of February after the narrator's family links were revealed, and in July an internal BBC review found it infringed the corporation's journalistic standards on truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, 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 authority's broadcasting regulations.
"We have apologised for this and we agree with the regulator's ruling in full. We will adhere to the directive as soon as the date and language are finalised."
