The British broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about Gaza was the child of a Hamas official, according to UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
The authority has ordered the corporation to transmit a evening statement about its findings.
"As this represents a major infringement of our rules, we are instructing the BBC to transmit a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Possibility to Erode Trust'
The authority's statement declared: "The inquiry we conducted determined that the programme's failure to disclose that the narrator's father served in a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have critical information which may have been very significant to their assessment of the voice and the details he presented.
"Trust is at the heart of the relationship between a media organization and its public, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to undermine the very considerable levels of trust that viewers would have put in a BBC factual programme about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in the month of February after the presenter's family links came to light, and in this past July an broadcaster's internal assessment concluded it breached the corporation's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The authority's determination is in accordance 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 reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in its entirety. We will comply with the directive as soon as the schedule and language are finalised."
