The public service broadcaster was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza conflict was the offspring of a Hamas representative, according to UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to truthfulness".
The authority has ordered the BBC to broadcast a peak-time declaration about its findings.
"As this represents a serious breach of our code, we are instructing the BBC to air a statement of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," the statement read.
'Risk to Erode Confidence'
The watchdog's report stated: "The inquiry we conducted concluded that the documentary's omission to reveal that the voice's parent held a post in the Hamas-run government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been very significant to their evaluation of the narrator and the content he provided.
"Confidence is at the core of the connection between a broadcaster and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to undermine the significantly high amounts of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The film 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 determined it infringed the organization's editorial guidelines on truthfulness.
A BBC spokesperson stated: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in complete. We will adhere to the penalty as soon as the date and language are finalised."
