The British broadcaster committed a "major breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe 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 previously apologised, stating there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to transmit a peak-time announcement about its decisions.
"Since this amounts to a major infringement of our rules, we are instructing the broadcaster to air a message of our findings against it on the BBC's second channel at 9pm, with a timing to be finalised," the statement read.
'Possibility to Damage Confidence'
The authority's announcement declared: "Our probe determined that the film's omission to reveal that the presenter's father held a post in the Hamas-controlled administration was materially misleading.
"Consequently that the viewers did not have critical information which may have been highly relevant to their evaluation of the narrator and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to erode the significantly high degrees of trust that audiences would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the online platform in the month of February after the presenter's family links were revealed, and in July an internal BBC review determined it violated the broadcaster's journalistic standards on factual correctness.
A corporation official said: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in complete. We will follow the sanction as soon as the date and language are finalised."
