The public service broadcaster committed a "serious breach" of media regulations by omitting to mention that the narrator of a programme about Gaza was the child of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the broadcaster to transmit a peak-time declaration about its findings.
"As this represents a serious breach of our rules, we are instructing the corporation to transmit a announcement of our determinations against it on BBC Two at 21:00, with a timing to be confirmed," the statement read.
'Risk to Undermine Credibility'
The watchdog's announcement said: "Our probe concluded that the programme's omission to reveal that the narrator's male guardian held a role in the Hamas-controlled government was materially misleading.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their judgment of the narrator and the details he shared.
"Trust is at the core of the bond between a media organization and its public, particularly for a public service broadcaster such as the public broadcaster.
"This error had the risk to undermine the very considerable amounts of credibility that audiences would have invested in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in the month of February after the narrator's personal associations came to light, and in this past July an corporation's own inquiry concluded it violated the corporation's journalistic standards on accuracy.
A corporation official commented: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in full. We will adhere to the penalty as soon as the schedule and language are confirmed."
