The BBC was found to have committed a "major breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a major oversight in relation to accuracy".
The regulator has ordered the BBC to broadcast a peak-time announcement about its findings.
"Since this amounts to a significant violation of our regulations, we are directing the corporation to air a announcement of our conclusions against it on the BBC's second channel at 21:00, with a schedule to be finalised," the statement read.
'Risk to Damage Confidence'
The regulator's statement declared: "Our investigation determined that the programme's omission to reveal that the narrator's father served in a role in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been highly relevant to their evaluation of the narrator and the details he presented.
"Trust is at the heart of the connection between a television network and its public, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the possibility to damage the exceptionally strong degrees of credibility that the public would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was removed from iPlayer in the month of February after the presenter's family links came to light, and in this past July an internal BBC review concluded it infringed the corporation's editorial guidelines on accuracy.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the sanction as soon as the schedule and wording are confirmed."
