The public service broadcaster was found to have committed a "major breach" of media regulations by failing to disclose that the narrator of a programme about the Gaza situation was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to factual correctness".
The authority has ordered the BBC to broadcast a peak-time announcement about its decisions.
"Since this amounts to a major infringement of our code, we are instructing the corporation to transmit a message of our findings against it on BBC2 at 21:00, with a schedule to be finalised," the regulator stated.
'Risk to Erode Confidence'
The regulator's announcement said: "The inquiry we conducted concluded that the film's failure to disclose that the presenter's male guardian held a position in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have vital facts which may have been highly relevant to their evaluation of the narrator and the details he shared.
"Credibility is at the core of the bond between a broadcaster and its viewers, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to erode the very considerable degrees of credibility that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the online platform in the month of February after the narrator's family links emerged, and in this past July an corporation's own inquiry found it breached the corporation's content policies on truthfulness.
A corporation official commented: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will comply with the sanction as soon as the timing and language are confirmed."
