The British broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a programme about Gaza was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to air a peak-time declaration about its conclusions.
"As this represents a significant violation of our regulations, we are instructing the BBC to air a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Possibility to Erode Credibility'
The watchdog's report said: "Our probe concluded that the film's omission to reveal that the presenter's parent occupied a position in the Hamas-run administration was substantially inaccurate.
"It meant that the audience did not have essential details which may have been extremely pertinent to their evaluation of the voice and the information he presented.
"Trust is at the core of the bond between a media organization and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to erode the exceptionally strong amounts of trust that viewers would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the narrator's familial connections came to light, and in this past July an internal BBC review determined it infringed the organization's journalistic standards on factual correctness.
A corporation official stated: "The Ofcom ruling is in agreement with the results of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will adhere to the directive as soon as the timing and wording are finalised."
