The BBC engaged in a "serious breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the child of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to air a evening announcement about its findings.
"Given this constitutes a significant violation of our code, we are instructing the BBC to broadcast a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be determined," the regulator stated.
'Risk to Erode Confidence'
The regulator's statement said: "Our investigation determined that the programme's failure to disclose that the narrator's parent held a role in the Hamas-run administration was materially misleading.
"Consequently that the audience did not have essential details which may have been highly relevant to their evaluation of the voice and the content he shared.
"Confidence is at the core of the bond between a television network and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the very considerable degrees of credibility that viewers would have put in a BBC factual programme about the Gaza conflict."
The documentary was pulled from the online platform in the month of February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment concluded it violated the broadcaster's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the results of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in complete. We will follow the directive as soon as the schedule and wording are finalised."
