The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to factual correctness".
The authority has ordered the broadcaster to broadcast a prime-time declaration about its decisions.
"Given this constitutes a serious breach of our rules, we are instructing the BBC to transmit a statement of our conclusions against it on the BBC's second channel at 21:00, with a date to be determined," the statement read.
'Potential to Undermine Credibility'
The watchdog's announcement declared: "The inquiry we conducted determined that the programme's lack of disclosure that the voice's male guardian held a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the details he presented.
"Trust is at the center of the relationship between a television network and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable amounts of confidence that the public would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was removed from iPlayer in last February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment found it infringed the corporation's content policies on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the timing and wording are determined."
