The British broadcaster committed a "serious breach" of media regulations by omitting to mention that the voice of a programme about the Gaza situation was the child of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to accuracy".
Ofcom has instructed the BBC to broadcast a peak-time declaration about its findings.
"Since this amounts to a major infringement of our code, we are instructing the BBC to broadcast a announcement of our determinations against it on BBC2 at 9pm, with a timing to be determined," the regulator stated.
'Risk to Erode Credibility'
The authority's statement declared: "Our investigation concluded that the programme's failure to disclose that the narrator's father held a post in the Hamas-administered authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the content he provided.
"Trust is at the heart of the relationship between a broadcaster and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the potential to damage the significantly high degrees of trust that audiences would have placed in a BBC factual programme about the Gaza conflict."
The programme was pulled from the BBC's streaming service in last February after the boy's familial connections emerged, and in the month of July an corporation's own inquiry determined it violated the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in its entirety. We will comply with the sanction as soon as the timing and language are confirmed."
