The BBC committed a "major breach" of broadcasting rules by not revealing that the voice of a programme about Gaza was the child of a Hamas official, as determined by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to truthfulness".
The regulator has directed the corporation to air a evening statement about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to transmit a statement of our findings against it on the BBC's second channel at 21:00, with a date to be determined," it said.
'Potential to Undermine Trust'
The watchdog's announcement stated: "Our investigation determined that the film's lack of disclosure that the presenter's parent served in a post in the Hamas-run government was significantly deceptive.
"This implied that the audience did not have essential details which may have been highly relevant to their assessment of the narrator and the details he shared.
"Confidence is at the heart of the relationship between a media organization and its audience, notably for a public service broadcaster such as the BBC.
"This oversight had the risk to erode the exceptionally strong amounts of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The film was removed from iPlayer in February after the boy's family links were revealed, and in this past July an broadcaster's internal assessment determined it violated the broadcaster's journalistic standards on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in full. We will comply with the penalty as soon as the timing and wording are finalised."
