The public service broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the voice of a programme about the Gaza conflict was the offspring of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has directed the broadcaster to transmit a prime-time announcement about its findings.
"Since this amounts to a serious breach of our rules, we are directing the broadcaster to air a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Possibility to Undermine Confidence'
The regulator's report declared: "Our investigation determined that the programme's failure to disclose that the voice's parent occupied a role in the Hamas-run government was significantly deceptive.
"This implied that the public did not have critical information which may have been highly relevant to their judgment of the voice and the details he provided.
"Confidence is at the core of the relationship between a broadcaster and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to erode the very considerable amounts of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from iPlayer in February after the presenter's familial connections came to light, and in this past July an broadcaster's internal assessment determined it breached the corporation's content policies on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in its entirety. We will adhere to the sanction as soon as the schedule and wording are determined."
