The British broadcaster engaged in a "serious breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza situation was the offspring of a Hamas official, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, noting there had been "a serious error in relation to accuracy".
The authority has directed the corporation to transmit a prime-time statement about its conclusions.
"Since this amounts to a serious breach of our rules, we are ordering the corporation to broadcast a statement of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Risk to Damage Trust'
The regulator's report stated: "Our investigation found that the programme's omission to reveal that the narrator's male guardian occupied a role in the Hamas-controlled government was significantly deceptive.
"This implied that the public did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the details he shared.
"Trust is at the core of the bond between a media organization and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the possibility to damage the exceptionally strong degrees of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from the BBC's streaming service in last February after the narrator's family links came to light, and in this past July an corporation's own inquiry concluded it breached the organization's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will adhere to the penalty as soon as the timing and wording are determined."
