The BBC committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the corporation to air a evening announcement about its findings.
"Given this constitutes a significant violation of our code, we are directing the BBC to air a statement of our findings against it on BBC2 at 21:00, with a date to be confirmed," it said.
'Possibility to Erode Trust'
The regulator's statement declared: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's parent held a post in the Hamas-controlled administration was significantly deceptive.
"It meant that the public did not have vital facts which may have been highly relevant to their assessment of the narrator and the details he shared.
"Confidence is at the center of the relationship between a broadcaster and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to damage the significantly high amounts of trust that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from the online platform in last February after the presenter's personal associations were revealed, and in July an internal BBC review concluded it breached the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in accordance with the results of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the directive as soon as the schedule and wording are determined."
