The BBC was found to have committed a "serious breach" of industry standards by failing to disclose that the voice of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a significant failing in relation to factual correctness".
Ofcom has directed the BBC to air a peak-time announcement about its decisions.
"Since this amounts to a major infringement of our rules, we are directing the BBC to transmit a statement of our findings against it on BBC2 at 9pm, with a schedule to be determined," it said.
'Risk to Erode Trust'
The regulator's report declared: "Our investigation concluded that the documentary's omission to reveal that the voice's father served in a post in the Hamas-administered authority was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been very significant to their evaluation of the voice and the details he presented.
"Confidence is at the heart of the relationship between a media organization and its public, especially for a public service broadcaster such as the public broadcaster.
"This error had the risk to erode the very considerable degrees of credibility that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from iPlayer in last February after the narrator's familial connections were revealed, and in the month of July an corporation's own inquiry concluded it breached the broadcaster's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the penalty as soon as the timing and wording are confirmed."
