The BBC engaged in a "serious breach" of industry standards by not revealing that the presenter of a programme about the Gaza situation was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to factual correctness".
Ofcom has directed the BBC to air a evening declaration about its conclusions.
"Given this constitutes a significant violation of our regulations, we are directing the BBC to air a announcement of our determinations against it on BBC Two at 9pm, with a date to be confirmed," it said.
'Possibility to Erode Trust'
The authority's announcement said: "Our investigation determined that the programme's lack of disclosure that the presenter's father occupied a position in the Hamas-administered authority was significantly deceptive.
"It meant that the public did not have critical information which may have been highly relevant to their assessment of the narrator and the information he provided.
"Trust is at the core of the bond between a media organization and its public, especially for a public service broadcaster such as the BBC.
"This oversight had the possibility to damage the significantly high degrees of credibility that the public would have put in a BBC factual programme about the conflict in Gaza."
The film was removed from the online platform in last February after the presenter's familial connections emerged, and in this past July an corporation's own inquiry determined it infringed the broadcaster's content policies on factual correctness.
A corporation official stated: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will adhere to the sanction as soon as the schedule and wording are confirmed."
