The public service broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the narrator of a film about the Gaza conflict was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the corporation to broadcast a prime-time declaration about its conclusions.
"Given this constitutes a serious breach of our regulations, we are ordering the BBC to broadcast a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the statement read.
'Potential to Erode Credibility'
The watchdog's statement declared: "Our investigation concluded that the film's lack of disclosure that the presenter's father held a role in the Hamas-controlled authority was materially misleading.
"This implied that the audience did not have essential details which may have been very significant to their assessment of the presenter and the information he shared.
"Credibility is at the core of the bond between a television network and its public, especially for a national broadcasting corporation such as the BBC.
"This error had the possibility to damage the significantly high amounts of confidence that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the presenter's personal associations were revealed, and in July an internal BBC review found it violated the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson commented: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will adhere to the directive as soon as the timing and wording are determined."
