The British broadcaster was found to have committed a "serious breach" of media regulations by not revealing that the narrator of a programme about the Gaza conflict was the son of a Hamas representative, as determined by regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to factual correctness".
Ofcom has instructed the corporation to broadcast a peak-time statement about its findings.
"Since this amounts to a significant violation of our regulations, we are instructing the corporation to broadcast a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The watchdog's announcement stated: "Our investigation concluded that the documentary's lack of disclosure that the presenter's parent served in a position in the Hamas-run authority was substantially inaccurate.
"It meant that the public did not have critical information which may have been highly relevant to their evaluation of the presenter and the details he provided.
"Trust is at the core of the bond between a broadcaster and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to damage the exceptionally strong levels of confidence that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The film was removed from iPlayer in February after the boy's family links came to light, and in July an internal BBC review determined it infringed the organization's journalistic standards on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will follow the sanction as soon as the date and wording are determined."
