The British broadcaster committed a "significant breach" of media regulations by omitting to mention that the voice of a programme about the Gaza conflict was the offspring of a Hamas representative, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
Ofcom has directed the BBC to transmit a evening statement about its decisions.
"As this represents a serious breach of our code, we are instructing the BBC to air a statement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," it said.
'Risk to Damage Trust'
The regulator's report said: "Our investigation determined that the documentary's failure to disclose that the presenter's male guardian served in a role in the Hamas-administered government was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the information he shared.
"Trust is at the core of the bond between a broadcaster and its viewers, especially for a public service broadcaster such as the BBC.
"This error had the possibility to erode the significantly high amounts of confidence that the public would have put in a BBC factual programme about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in the month of February after the boy's familial connections emerged, and in the month of July an corporation's own inquiry determined it infringed the broadcaster's journalistic standards on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the regulator's media standards.
"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 date and language are determined."
