The British broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a programme about Gaza was the son of a Hamas representative, according to UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our regulations, we are ordering the BBC to air a statement of our determinations against it on BBC Two at 9pm, with a schedule to be confirmed," the statement read.
'Potential to Undermine Credibility'
The watchdog's report stated: "Our probe determined that the film's lack of disclosure that the presenter's father served in a role in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have critical information which may have been very significant to their evaluation of the presenter and the information he shared.
"Trust is at the center of the relationship between a media organization and its viewers, notably for a national broadcasting corporation such as the BBC.
"This error had the possibility to erode the significantly high amounts of confidence that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the narrator's family links emerged, and in July an internal BBC review found it infringed the corporation's journalistic standards on truthfulness.
A corporation official commented: "The regulator's decision is in accordance 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 aligns with regulation 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 follow the sanction as soon as the date and language are confirmed."
