The BBC engaged in a "major breach" of media regulations by omitting to mention that the narrator of a documentary about the Gaza situation was the son of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the corporation to transmit a evening announcement about its decisions.
"As this represents a major infringement of our code, we are instructing the corporation to air a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Undermine Credibility'
The authority's report stated: "Our investigation concluded that the film's omission to reveal that the narrator's father held a position in the Hamas-administered authority was significantly deceptive.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the details he presented.
"Trust is at the heart of the connection between a broadcaster and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to undermine the exceptionally strong levels 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 boy's familial connections were revealed, and in this past July an broadcaster's internal assessment found it violated the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in full. We will comply with the penalty as soon as the timing and wording are finalised."
