The BBC committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a programme about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had previously apologised, noting there had been "a significant failing in relation to accuracy".
The regulator has directed the BBC to broadcast a peak-time statement about its findings.
"Since this amounts to a major infringement of our regulations, we are directing the corporation to air a message of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be finalised," the statement read.
'Possibility to Undermine Credibility'
The watchdog's announcement stated: "Our probe found that the film's lack of disclosure that the presenter's parent occupied a role in the Hamas-run administration was substantially inaccurate.
"This implied that the public did not have vital facts which may have been very significant to their assessment of the narrator and the details he shared.
"Trust is at the core of the relationship between a media organization and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the risk to erode the very considerable amounts of credibility that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will comply with the penalty as soon as the timing and wording are determined."
