The BBC engaged in a "significant breach" of industry standards by not revealing that the presenter of a programme about Gaza was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
The authority has ordered the broadcaster to broadcast a peak-time statement about its conclusions.
"Given this constitutes a serious breach of our rules, we are directing the corporation to broadcast a announcement of our determinations against it on BBC Two at 9pm, with a date to be confirmed," the regulator stated.
'Possibility to Erode Credibility'
The watchdog's announcement declared: "Our probe determined that the documentary's omission to reveal that the voice's male guardian occupied a role in the Hamas-administered authority was substantially inaccurate.
"It meant that the public did not have critical information which may have been very significant to their evaluation of the voice and the details he shared.
"Confidence is at the center of the relationship between a broadcaster and its audience, especially for a state-funded media outlet such as the BBC.
"This error had the possibility to undermine the exceptionally strong amounts of trust that the public would have placed in a BBC factual programme about the Gaza conflict."
The film was pulled from iPlayer in the month of February after the boy's personal associations emerged, and in July an broadcaster's internal assessment found it breached the corporation's content policies on factual correctness.
A corporation official stated: "The regulator's decision is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in complete. We will follow the penalty as soon as the timing and language are determined."
