The BBC engaged in a "major breach" of industry standards by omitting to mention that the presenter of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the corporation to transmit a evening statement about its findings.
"Given this constitutes a major infringement of our code, we are instructing the corporation to air a message of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," it said.
'Risk to Damage Confidence'
The watchdog's report said: "Our probe concluded that the documentary's lack of disclosure that the voice's father occupied a position in the Hamas-administered government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their assessment of the presenter and the details he provided.
"Credibility is at the core of the relationship between a broadcaster and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to erode the exceptionally strong levels of credibility that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from the online platform in February after the boy's personal associations emerged, and in this past July an corporation's own inquiry found it breached the corporation's editorial guidelines on truthfulness.
A BBC spokesperson stated: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the authority's determination in full. We will comply with the penalty as soon as the date and language are determined."
