The public service broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the presenter of a film about the Gaza conflict was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to accuracy".
Ofcom has directed the broadcaster to transmit a peak-time statement about its decisions.
"Since this amounts to a major infringement of our regulations, we are ordering the BBC to air a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be confirmed," the statement read.
'Possibility to Erode Confidence'
The authority's report stated: "Our probe found that the programme's omission to reveal that the narrator's parent occupied a position in the Hamas-run authority was significantly deceptive.
"It meant that the viewers did not have essential details which may have been very significant to their assessment of the narrator and the information he presented.
"Trust is at the center of the bond between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to damage the significantly high amounts of trust that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was removed from the BBC's streaming service in February after the presenter's personal associations emerged, and in the month of July an broadcaster's internal assessment found it breached the organization's editorial guidelines on accuracy.
A BBC spokesperson said: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the schedule and wording are determined."
