The British broadcaster committed a "serious breach" of industry standards by failing to disclose that the voice of a programme about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to accuracy".
The regulator has instructed the corporation to broadcast a prime-time announcement about its findings.
"Since this amounts to a significant violation of our code, we are directing the broadcaster to broadcast a statement of our determinations against it on BBC2 at 21:00, with a schedule to be finalised," it said.
'Potential to Damage Credibility'
The watchdog's statement declared: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's parent held a role in the Hamas-run administration was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been very significant to their judgment of the voice and the information he presented.
"Credibility is at the heart of the relationship between a media organization and its viewers, notably for a public service broadcaster such as the BBC.
"This failing had the risk to damage the very considerable degrees of credibility that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in last February after the presenter's family links emerged, and in the month of July an broadcaster's internal assessment found it breached the broadcaster's journalistic standards on accuracy.
A corporation official commented: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the authority's determination in complete. We will comply with the penalty as soon as the timing and language are finalised."
