The public service broadcaster was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about Gaza was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a peak-time statement about its findings.
"As this represents a major infringement of our rules, we are instructing the BBC to broadcast 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 determined," the regulator stated.
'Possibility to Damage Confidence'
The authority's announcement stated: "The inquiry we conducted concluded that the programme's lack of disclosure that the voice's father held a post in the Hamas-administered authority was significantly deceptive.
"Consequently that the public did not have critical information which may have been extremely pertinent to their judgment of the presenter and the details he shared.
"Trust is at the heart of the connection between a television network and its public, particularly for a public service broadcaster such as the BBC.
"This oversight had the possibility to undermine the very considerable degrees of confidence that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry concluded it breached the corporation's journalistic standards on factual correctness.
A BBC spokesperson stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the date and wording are determined."
