The public service broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the voice of a film about the Gaza conflict was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to truthfulness".
The authority has directed the corporation to air a evening statement about its conclusions.
"Since this amounts to a major infringement of our rules, we are directing the corporation to transmit a statement of our determinations against it on BBC2 at 9pm, with a date to be finalised," the statement read.
'Possibility to Undermine Trust'
The watchdog's report declared: "The inquiry we conducted determined that the documentary's lack of disclosure that the voice's male guardian served in a position in the Hamas-controlled government was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Trust is at the center of the bond between a broadcaster and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the very considerable amounts of confidence that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in the month of February after the boy's family links emerged, and in this past July an broadcaster's internal assessment determined it violated the broadcaster's content policies on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the regulator's ruling in full. We will comply with the penalty as soon as the timing and wording are confirmed."
