The British broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the voice of a programme about the Gaza conflict was the son of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
Ofcom has directed the broadcaster to transmit a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our code, we are directing the corporation to air a statement of our findings against it on the BBC's second channel at 21:00, with a timing to be finalised," the statement read.
'Potential to Damage Trust'
The watchdog's report stated: "The inquiry we conducted found that the documentary's lack of disclosure that the narrator's male guardian held a post in the Hamas-run authority was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the narrator and the information he presented.
"Confidence is at the core of the relationship between a television network and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to undermine the exceptionally strong degrees of trust that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The programme was removed from the BBC's streaming service in February after the boy's personal associations were revealed, and in the month of July an broadcaster's internal assessment concluded it violated the organization's content policies on truthfulness.
A BBC spokesperson said: "The authority's determination is in line with the results of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will comply with the sanction as soon as the timing and wording are confirmed."
