The BBC committed a "serious breach" of media regulations by not revealing that the presenter of a documentary about the Gaza situation was the son 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 determined that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to transmit a evening declaration about its findings.
"Given this constitutes a major infringement of our code, we are directing the broadcaster to transmit a announcement of our findings against it on BBC Two at 9pm, with a schedule to be finalised," the statement read.
'Potential to Erode Credibility'
The authority's statement stated: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's father served in a post in the Hamas-administered authority was substantially inaccurate.
"Consequently that the public did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the content he provided.
"Confidence is at the heart of the relationship between a broadcaster and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to erode the exceptionally strong amounts of confidence that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from the online platform in last February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment concluded it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official stated: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will comply with the sanction as soon as the timing and wording are confirmed."
