The British broadcaster committed a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
The authority has instructed the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a serious breach of our regulations, we are ordering the BBC to broadcast a statement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Potential to Damage Trust'
The regulator's statement declared: "Our probe determined that the programme's omission to reveal that the presenter's male guardian served in a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the audience did not have vital facts which may have been very significant to their judgment of the presenter and the information he provided.
"Confidence is at the heart of the relationship between a media organization and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to undermine the very considerable levels of credibility that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in February after the narrator's family links came to light, and in the month of July an corporation's own inquiry found it infringed the organization's content policies on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in full. We will comply with the sanction as soon as the date and language are determined."
