The British broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza conflict was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The regulator has directed the BBC to air a evening announcement about its decisions.
"As this represents a major infringement of our code, we are directing the BBC to broadcast a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," it said.
'Possibility to Undermine Trust'
The watchdog's announcement stated: "The inquiry we conducted determined that the documentary's lack of disclosure that the presenter's father held a post in the Hamas-controlled government was materially misleading.
"Consequently that the viewers did not have essential details which may have been highly relevant to their evaluation of the narrator and the content he presented.
"Credibility is at the heart of the bond between a broadcaster and its public, particularly for a state-funded media outlet such as the BBC.
"This oversight had the potential to erode the significantly high levels of trust that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was removed from the online platform in the month of February after the narrator's personal associations came to light, and in this past July an internal BBC review determined it breached the organization's journalistic standards on truthfulness.
A BBC spokesperson said: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will adhere to the directive as soon as the timing and wording are confirmed."
