The public service broadcaster was found to have committed a "serious breach" of industry standards by failing to disclose that the voice of a film about the Gaza conflict was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to broadcast a peak-time declaration about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the broadcaster to broadcast a announcement of our determinations against it on BBC2 at 21:00, with a date to be finalised," the statement read.
'Possibility to Damage Confidence'
The watchdog's announcement declared: "Our investigation determined that the film's omission to reveal that the narrator's father occupied a role in the Hamas-controlled government was substantially inaccurate.
"This implied that the public did not have vital facts which may have been very significant to their judgment of the presenter and the details he provided.
"Confidence is at the heart of the connection between a broadcaster and its audience, especially for a state-funded media outlet such as the BBC.
"This failing had the possibility to undermine the exceptionally strong degrees of trust that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from iPlayer in last February after the boy's familial connections emerged, and in the month of July an corporation's own inquiry concluded it infringed the broadcaster's editorial guidelines on factual correctness.
A corporation official stated: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in complete. We will follow the sanction as soon as the schedule and wording are finalised."
