The public service broadcaster was found to have committed a "significant breach" of industry standards by not revealing that the voice of a documentary about Gaza was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The authority has instructed the broadcaster to transmit a evening declaration about its findings.
"As this represents a serious breach of our code, we are directing the corporation to broadcast a statement of our determinations against it on BBC Two at 9pm, with a schedule to be finalised," it said.
'Potential to Damage Confidence'
The authority's statement declared: "Our investigation concluded that the film's failure to disclose that the narrator's male guardian held a role in the Hamas-run authority was substantially inaccurate.
"This implied that the public did not have critical information which may have been highly relevant to their evaluation of the voice and the content he shared.
"Credibility is at the core of the bond between a broadcaster and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to undermine the significantly high levels of confidence that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from iPlayer in February after the boy's family links came to light, and in the month of July an broadcaster's internal assessment determined it breached the broadcaster's editorial guidelines on accuracy.
A corporation official commented: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in complete. We will follow the sanction as soon as the date and wording are finalised."
