The public service broadcaster committed a "serious breach" of industry standards by failing to disclose that the voice of a programme about the Gaza situation was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The regulator has directed the BBC to broadcast a evening statement about its findings.
"As this represents a major infringement of our code, we are instructing the corporation to broadcast a message of our conclusions against it on BBC2 at 21:00, with a date to be finalised," the statement read.
'Possibility to Undermine Confidence'
The authority's report stated: "Our investigation concluded that the film's omission to reveal that the voice's father occupied a position in the Hamas-run authority was materially misleading.
"It meant that the public did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Credibility is at the heart of the bond between a television network and its viewers, notably for a public service broadcaster such as the BBC.
"This error had the possibility to erode the very considerable degrees of credibility that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the boy's familial connections came to light, and in this past July an internal BBC review concluded it breached the corporation's content policies on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the authority's determination in its entirety. We will adhere to the penalty as soon as the timing and wording are determined."
