The British broadcaster engaged in a "serious breach" of media regulations by omitting to mention that the narrator of a documentary about the Gaza conflict was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The authority has instructed the corporation to air a evening declaration about its findings.
"As this represents a major infringement of our code, we are ordering the broadcaster to air a statement of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," it said.
'Potential to Erode Confidence'
The regulator's statement stated: "Our probe found that the programme's lack of disclosure that the voice's father occupied a position in the Hamas-administered government was materially misleading.
"Consequently that the public did not have vital facts which may have been highly relevant to their evaluation of the presenter and the content he presented.
"Confidence is at the core of the relationship between a television network and its public, notably for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the very considerable levels of trust that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in last February after the boy's family links came to light, and in July an corporation's own inquiry found it breached the organization's content policies on truthfulness.
A corporation official stated: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in full. We will follow the penalty as soon as the schedule and language are confirmed."
