The public service broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a documentary about the Gaza conflict was the child of a Hamas representative, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a prime-time announcement about its findings.
"As this represents a major infringement of our rules, we are ordering the broadcaster to broadcast a announcement of our determinations against it on BBC2 at 9pm, with a timing to be confirmed," it said.
'Potential to Undermine Credibility'
The watchdog's report said: "The inquiry we conducted concluded that the film's omission to reveal that the narrator's male guardian held a role in the Hamas-administered government was significantly deceptive.
"It meant that the viewers did not have essential details which may have been very significant to their evaluation of the narrator and the information he presented.
"Credibility is at the center of the connection between a broadcaster and its viewers, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to undermine the exceptionally strong degrees of trust that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from iPlayer in the month of February after the narrator's familial connections came to light, and in July an corporation's own inquiry concluded it breached the broadcaster's content policies on truthfulness.
A corporation official stated: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will comply with the penalty as soon as the date and language are finalised."
