The BBC committed a "major breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The authority has instructed the corporation to air a evening declaration about its conclusions.
"As this represents a serious breach of our regulations, we are directing the broadcaster to air a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," the statement read.
'Potential to Damage Confidence'
The watchdog's report declared: "Our investigation found that the film's omission to reveal that the presenter's male guardian served in a position in the Hamas-run administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been highly relevant to their judgment of the narrator and the content he provided.
"Credibility is at the heart of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the BBC.
"This error had the potential to erode the very considerable amounts of trust that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the narrator's family links came to light, and in this past July an internal BBC review determined it breached the corporation's journalistic standards on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in agreement with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and wording are determined."
