The BBC committed a "major breach" of industry standards by omitting to mention that the narrator of a film about the Gaza situation was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The authority has instructed the BBC to broadcast a peak-time declaration about its decisions.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to air a message of our findings against it on BBC2 at 21:00, with a timing to be confirmed," the regulator stated.
'Possibility to Damage Trust'
The regulator's report said: "Our investigation concluded that the film's lack of disclosure that the narrator's male guardian occupied a position in the Hamas-run authority was materially misleading.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the information he presented.
"Credibility is at the core of the connection between a television network and its public, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to undermine the very considerable levels of trust that viewers would have invested in a BBC factual programme about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the presenter's personal associations came to light, and in the month of July an corporation's own inquiry found it violated the broadcaster's content policies on truthfulness.
A corporation official stated: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will follow the directive as soon as the date and wording are finalised."
