The public service broadcaster committed a "major breach" of media regulations by failing to disclose that the voice of a film about Gaza was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to accuracy".
The authority has instructed the broadcaster to air a prime-time statement about its findings.
"As this represents a serious breach of our code, we are directing the corporation to air a message of our determinations against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the statement read.
'Potential to Damage Credibility'
The authority's announcement stated: "Our investigation concluded that the documentary's lack of disclosure that the narrator's father served in a post in the Hamas-administered government was materially misleading.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their assessment of the narrator and the content he presented.
"Confidence is at the heart of the connection between a broadcaster and its audience, particularly for a public service broadcaster such as the BBC.
"This oversight had the risk to undermine the exceptionally strong amounts of trust that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from the BBC's streaming service in February after the presenter's personal associations were revealed, and in July an corporation's own inquiry determined it breached the corporation's journalistic standards on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will adhere to the penalty as soon as the timing and language are determined."
