The British broadcaster committed a "significant breach" of industry standards by failing to disclose that the presenter of a film about Gaza was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found 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 factual correctness".
The authority has ordered the broadcaster to transmit a prime-time declaration about its conclusions.
"Given this constitutes a significant violation of our regulations, we are directing the BBC to transmit a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Potential to Undermine Confidence'
The authority's statement said: "The inquiry we conducted determined that the film's failure to disclose that the presenter's father occupied a post in the Hamas-run authority was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the voice and the information he presented.
"Credibility is at the center of the bond between a broadcaster and its viewers, especially for a public service broadcaster such as the BBC.
"This oversight had the potential to damage the significantly high levels of credibility that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from the online platform in last February after the boy's familial connections were revealed, and in this past July an corporation's own inquiry concluded it violated the broadcaster's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in full. We will adhere to the directive as soon as the timing and language are finalised."
