The British broadcaster committed a "serious breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the son of a Hamas official, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to accuracy".
The authority has directed the corporation to air a peak-time announcement about its decisions.
"As this represents a major infringement of our regulations, we are directing the corporation to broadcast a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the statement read.
'Potential to Damage Trust'
The watchdog's report stated: "Our investigation determined that the documentary's lack of disclosure that the narrator's father served in a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been very significant to their judgment of the voice and the content he shared.
"Confidence is at the center of the connection between a television network and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to damage the exceptionally strong degrees of confidence that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was pulled from iPlayer in February after the narrator's familial connections came to light, and in this past July an internal BBC review determined it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 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 comply with the directive as soon as the date and wording are finalised."
