The British broadcaster was found to have committed a "serious breach" of media regulations by failing to disclose that the narrator of a programme about the Gaza conflict was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the broadcaster to broadcast a evening statement about its decisions.
"Since this amounts to a significant violation of our regulations, we are instructing the BBC to air a announcement of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be finalised," the statement read.
'Potential to Erode Trust'
The watchdog's report declared: "Our investigation found that the programme's lack of disclosure that the voice's parent held a post in the Hamas-run administration was substantially inaccurate.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their evaluation of the narrator and the details he presented.
"Credibility is at the heart of the connection between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to damage the very considerable degrees of credibility that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in last February after the presenter's familial connections emerged, and in this past July an corporation's own inquiry found it breached the organization's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The authority's determination is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in complete. We will adhere to the penalty as soon as the date and wording are determined."
