The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza conflict was the son of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to accuracy".
Ofcom has instructed the BBC to air a prime-time statement about its findings.
"Given this constitutes a serious breach of our regulations, we are directing the broadcaster to broadcast a message of our determinations against it on BBC2 at 21:00, with a timing to be confirmed," the regulator stated.
'Possibility to Damage Confidence'
The regulator's announcement declared: "Our investigation determined that the programme's failure to disclose that the narrator's male guardian served in a post in the Hamas-controlled authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the information he provided.
"Credibility is at the center of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the BBC.
"This error had the possibility to erode the very considerable amounts of credibility that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The film was removed from the online platform in the month of February after the presenter's personal associations emerged, and in July an broadcaster's internal assessment concluded it violated the broadcaster's editorial guidelines on factual correctness.
A corporation official stated: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the date and wording are determined."
