The British broadcaster committed a "major breach" of media regulations by not revealing that the narrator of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to accuracy".
Ofcom has ordered the broadcaster to air a evening statement about its conclusions.
"Given this constitutes a major infringement of our rules, we are instructing the broadcaster to broadcast a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," the statement read.
'Risk to Damage Credibility'
The regulator's report declared: "Our probe concluded that the film's lack of disclosure that the presenter's parent occupied a position in the Hamas-run government was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the information he presented.
"Confidence is at the center of the relationship between a broadcaster and its viewers, notably for a national broadcasting corporation such as the BBC.
"This error had the possibility to damage the exceptionally strong amounts of trust that the public would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from the BBC's streaming service in last February after the narrator's personal associations were revealed, and in July an corporation's own inquiry concluded it infringed the broadcaster's content policies on accuracy.
A corporation official stated: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will follow the sanction as soon as the timing and language are confirmed."
