The BBC committed a "major breach" of broadcasting rules by not revealing that the presenter of a film about the Gaza conflict was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the broadcaster to broadcast a peak-time declaration about its conclusions.
"As this represents a serious breach of our regulations, we are instructing the corporation to transmit a announcement of our findings against it on BBC2 at 9pm, with a date to be determined," it said.
'Risk to Undermine Credibility'
The authority's statement said: "Our probe found that the documentary's lack of disclosure that the narrator's parent held a position in the Hamas-run authority was significantly deceptive.
"This implied that the public did not have essential details which may have been highly relevant to their evaluation of the presenter and the details he presented.
"Trust is at the core of the bond between a broadcaster and its viewers, particularly for a public service broadcaster such as the BBC.
"This oversight had the potential to undermine the very considerable amounts of trust that audiences 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 presenter's family links came to light, and in the month of July an internal BBC review found it breached the corporation's content policies on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in its entirety. We will comply with the directive as soon as the timing and wording are confirmed."
