The BBC committed a "serious breach" of broadcasting rules by failing to disclose that the narrator of a programme about the Gaza situation was the child of a Hamas administrator, according to regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the corporation to broadcast a evening declaration about its conclusions.
"Since this amounts to a major infringement of our regulations, we are ordering the corporation to air a announcement of our conclusions against it on BBC2 at 21:00, with a schedule to be determined," the statement read.
'Possibility to Undermine Confidence'
The watchdog's statement said: "Our probe found that the film's failure to disclose that the narrator's parent occupied a position in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their judgment of the presenter and the content he presented.
"Credibility is at the heart of the bond between a television network and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to damage the exceptionally strong degrees of credibility that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the BBC's streaming service in the month of February after the presenter's family links were revealed, and in July an corporation's own inquiry determined it breached the corporation's editorial guidelines on truthfulness.
A corporation official said: "The authority's determination is in agreement with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in its entirety. We will adhere to the penalty as soon as the schedule and wording are confirmed."
