The public service broadcaster engaged in a "major breach" of media regulations by not revealing that the presenter of a film about Gaza was the offspring of a Hamas representative, according to regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a significant failing in relation to accuracy".
Ofcom has ordered the BBC to broadcast a peak-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are instructing the corporation to transmit a message of our conclusions against it on the BBC's second channel at 9pm, with a timing to be finalised," the regulator stated.
'Risk to Damage Credibility'
The regulator's statement stated: "Our investigation concluded that the documentary's lack of disclosure that the voice's parent occupied a post in the Hamas-run administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been highly relevant to their assessment of the presenter and the content he presented.
"Trust is at the core of the bond between a broadcaster and its public, notably for a public service broadcaster such as the public broadcaster.
"This failing had the risk to damage the exceptionally strong levels of credibility that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from iPlayer in the month of February after the presenter's family links emerged, and in this past July an corporation's own inquiry found it violated the corporation's content policies on truthfulness.
A corporation official commented: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on factual correctness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in full. We will adhere to the directive as soon as the schedule and wording are finalised."
