The BBC engaged in a "major breach" of broadcasting rules by not revealing that the voice of a film about the Gaza situation was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
Ofcom has instructed the broadcaster to air a evening declaration about its conclusions.
"Given this constitutes a serious breach of our rules, we are ordering the corporation to transmit a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," the regulator stated.
'Possibility to Erode Credibility'
The authority's statement said: "Our investigation determined that the film's failure to disclose that the narrator's father occupied a post in the Hamas-controlled authority was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the information he shared.
"Trust is at the center of the bond between a television network and its public, especially for a public service broadcaster such as the public broadcaster.
"This failing had the potential to undermine the significantly high levels of trust that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the online platform in last February after the presenter's personal associations were revealed, and in this past July an internal BBC review concluded it breached the corporation's journalistic standards on truthfulness.
A corporation official commented: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the sanction as soon as the date and wording are finalised."
