The public service broadcaster was found to have committed a "major breach" of industry standards by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has ordered the broadcaster to broadcast a peak-time declaration about its conclusions.
"Given this constitutes a significant violation of our code, we are ordering the corporation to air a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Possibility to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the film's failure to disclose that the presenter's parent held a position in the Hamas-administered government was materially misleading.
"This implied that the audience did not have critical information which may have been extremely pertinent to their evaluation of the voice and the details he shared.
"Trust is at the core of the connection between a media organization and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the very considerable levels of trust that viewers would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from the online platform in last February after the boy's familial connections were revealed, and in the month of July an broadcaster's internal assessment concluded it breached the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the date and language are determined."
