The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the narrator of a film about Gaza was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to accuracy".
The authority has directed the corporation to broadcast a prime-time announcement about its decisions.
"As this represents a major infringement of our regulations, we are directing the BBC to transmit a statement of our determinations against it on the BBC's second channel at 9pm, with a date to be finalised," it said.
'Potential to Erode Credibility'
The regulator's announcement declared: "The inquiry we conducted concluded that the documentary's failure to disclose that the presenter's father occupied a role in the Hamas-controlled government was materially misleading.
"It meant that the viewers did not have vital facts which may have been very significant to their judgment of the narrator and the content he shared.
"Credibility is at the core of the bond between a television network and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to damage the very considerable degrees of confidence that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from iPlayer in February after the presenter's personal associations emerged, and in the month of July an internal BBC review found it breached the broadcaster's content policies on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will adhere to the penalty as soon as the date and wording are determined."
