The public service broadcaster committed a "significant breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas official, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has ordered the corporation to broadcast a evening declaration about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to air a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be determined," the regulator stated.
'Possibility to Erode Trust'
The watchdog's announcement declared: "Our investigation concluded that the film's omission to reveal that the presenter's male guardian occupied a role in the Hamas-run authority was significantly deceptive.
"Consequently that the public did not have critical information which may have been extremely pertinent to their assessment of the presenter and the content he shared.
"Trust is at the core of the bond between a broadcaster and its viewers, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the very considerable amounts of confidence that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from iPlayer in the month of February after the presenter's familial connections emerged, and in the month of July an corporation's own inquiry concluded it infringed the corporation's content policies on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in full. We will adhere to the directive as soon as the date and wording are determined."
