The British broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a documentary about the Gaza conflict was the child of a Hamas representative, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The regulator has directed the corporation to air a evening declaration about its findings.
"Since this amounts to a serious breach of our code, we are ordering the broadcaster to air a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," the statement read.
'Possibility to Damage Confidence'
The authority's report declared: "Our investigation determined that the programme's lack of disclosure that the presenter's father occupied a position in the Hamas-run authority was materially misleading.
"This implied that the audience did not have vital facts which may have been very significant to their evaluation of the narrator and the information he shared.
"Credibility is at the core of the connection between a broadcaster and its viewers, especially for a national broadcasting corporation such as the BBC.
"This failing had the potential to undermine the exceptionally strong degrees of confidence that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from the BBC's streaming service in the month of February after the narrator's familial connections came to light, and in this past July an internal BBC review determined it breached the corporation's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The authority's determination is in agreement with the results of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the sanction as soon as the timing and language are determined."
