The public service broadcaster engaged in a "significant breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
The authority has directed the broadcaster to transmit a peak-time declaration about its findings.
"As this represents a serious breach of our rules, we are instructing the broadcaster to transmit a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be confirmed," the regulator stated.
'Possibility to Damage Trust'
The authority's statement declared: "Our investigation concluded that the programme's lack of disclosure that the voice's father occupied a post in the Hamas-administered administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the details he provided.
"Trust is at the heart of the bond between a media organization and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to undermine the significantly high levels of credibility that audiences would have put in a BBC factual programme about the conflict in Gaza."
The programme was removed from the BBC's streaming service in last February after the boy's familial connections emerged, and in July an internal BBC review concluded it infringed the organization's content policies on truthfulness.
A BBC spokesperson commented: "The authority's determination is in accordance with the findings of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and wording are confirmed."
