The British broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza conflict was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has directed the corporation to transmit a evening declaration about its decisions.
"As this represents a serious breach of our regulations, we are instructing the corporation to transmit a message of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be determined," the regulator stated.
'Possibility to Erode Confidence'
The authority's statement declared: "Our investigation determined that the film's lack of disclosure that the narrator's male guardian served in a role in the Hamas-administered government was materially misleading.
"It meant that the audience did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Trust is at the center of the relationship between a television network and its audience, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to undermine the significantly high degrees of trust that the public would have invested in a BBC factual programme about the conflict in Gaza."
The film was pulled from iPlayer in last February after the narrator's personal associations came to light, and in July an corporation's own inquiry determined it breached the corporation's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will adhere to the penalty as soon as the date and language are determined."
