The BBC was found to have committed a "major breach" of industry standards by failing to disclose that the presenter of a programme about the Gaza situation was the offspring of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
Ofcom has directed the corporation to air a peak-time announcement about its decisions.
"Since this amounts to a significant violation of our regulations, we are directing the corporation to air a statement of our determinations against it on BBC Two at 9pm, with a schedule to be determined," the statement read.
'Potential to Damage Confidence'
The watchdog's statement stated: "Our investigation found that the documentary's failure to disclose that the presenter's male guardian held a position in the Hamas-controlled government was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been highly relevant to their assessment of the voice and the content he shared.
"Trust is at the center of the connection between a media organization and its viewers, particularly for a state-funded media outlet such as the BBC.
"This failing had the potential to erode the very considerable levels of confidence that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in February after the boy's family links came to light, and in July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A corporation official said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the penalty as soon as the timing and wording are finalised."
