The British broadcaster engaged in a "serious breach" of media regulations by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
Ofcom has instructed the BBC to air a peak-time declaration about its decisions.
"Given this constitutes a significant violation of our code, we are instructing the corporation to transmit a statement of our conclusions against it on BBC2 at 21:00, with a date to be confirmed," it said.
'Possibility to Damage Confidence'
The watchdog's report declared: "Our investigation found that the documentary's lack of disclosure that the narrator's father held a post in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have critical information which may have been very significant to their judgment of the presenter and the details he shared.
"Confidence is at the core of the bond between a television network and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to damage the exceptionally strong amounts of credibility that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from the online platform in February after the presenter's family links were revealed, and in the month of July an internal BBC review found it breached the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in full. We will follow the penalty as soon as the schedule and wording are determined."
