The public service broadcaster engaged in a "serious breach" of media regulations by not revealing that the narrator of a documentary about the Gaza conflict was the child of a Hamas representative, according to UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to accuracy".
Ofcom has instructed the broadcaster to broadcast a peak-time declaration about its decisions.
"As this represents a serious breach of our code, we are ordering the broadcaster to broadcast a message of our determinations against it on BBC Two at 9pm, with a date to be finalised," the statement read.
'Risk to Undermine Credibility'
The watchdog's report said: "Our probe concluded that the documentary's lack of disclosure that the voice's father occupied a post in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the information he presented.
"Trust is at the heart of the relationship between a broadcaster and its audience, especially for a public service broadcaster such as the public broadcaster.
"This failing had the risk to damage the significantly high amounts of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from iPlayer in February after the boy's personal associations came to light, and in the month of July an corporation's own inquiry determined it infringed the corporation's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in agreement with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will comply with the sanction as soon as the schedule and wording are confirmed."
