The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza situation was the son of a Hamas representative, as determined by regulatory body Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to factual correctness".
The authority has ordered the corporation to air a peak-time declaration about its conclusions.
"As this represents a significant violation of our regulations, we are ordering the broadcaster to broadcast a statement of our conclusions against it on BBC Two at 9pm, with a schedule to be determined," the statement read.
'Risk to Damage Credibility'
The regulator's report declared: "Our investigation determined that the programme's omission to reveal that the narrator's male guardian served in a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he shared.
"Credibility is at the heart of the connection between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the possibility to undermine the significantly high levels of credibility that the public would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in the month of February after the narrator's personal associations came to light, and in this past July an corporation's own inquiry determined it infringed the corporation's content policies on truthfulness.
A BBC spokesperson stated: "The authority's determination is in agreement 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 accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in complete. We will follow the directive as soon as the schedule and wording are determined."
