The public service broadcaster committed a "significant breach" of media regulations by not revealing that the presenter of a programme about the Gaza situation was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the programme 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 directed the broadcaster to transmit a peak-time announcement about its findings.
"Since this amounts to a serious breach of our code, we are directing the broadcaster to air a statement of our conclusions against it on BBC Two at 21:00, with a timing to be determined," it said.
'Risk to Erode Credibility'
The regulator's report stated: "The inquiry we conducted found that the programme's lack of disclosure that the narrator's parent occupied a position in the Hamas-controlled authority was materially misleading.
"Consequently that the public did not have critical information which may have been extremely pertinent to their judgment of the presenter and the information he shared.
"Confidence is at the heart of the bond between a broadcaster and its public, particularly for a national broadcasting corporation such as the BBC.
"This error had the possibility to erode the exceptionally strong levels of trust that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in the month of February after the presenter's family links emerged, and in the month of July an internal BBC review concluded it violated the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will follow the penalty as soon as the date and language are confirmed."
