The BBC committed a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about Gaza was the son of a Hamas official, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has ordered the BBC to air a evening statement about its conclusions.
"Since this amounts to a serious breach of our code, we are ordering the BBC to broadcast a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Risk to Undermine Credibility'
The regulator's report stated: "The inquiry we conducted concluded that the programme's lack of disclosure that the presenter's parent served in a post in the Hamas-administered government was substantially inaccurate.
"This implied that the public did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the content he presented.
"Credibility is at the core of the bond between a broadcaster and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This failing had the potential to undermine the exceptionally strong amounts of trust that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the online platform in the month of February after the narrator's personal associations emerged, and in this past July an broadcaster's internal assessment found it violated the organization's content policies on accuracy.
A corporation official said: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in full. We will comply with the sanction as soon as the schedule and language are confirmed."
