The BBC committed a "serious breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the son of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to broadcast a evening statement about its conclusions.
"Given this constitutes a significant violation of our rules, we are ordering the broadcaster to air a announcement of our determinations against it on BBC2 at 21:00, with a schedule to be confirmed," it said.
'Possibility to Erode Confidence'
The authority's announcement stated: "Our investigation concluded that the programme's lack of disclosure that the voice's parent served in a position in the Hamas-run government was significantly deceptive.
"This implied that the audience did not have essential details which may have been very significant to their assessment of the presenter and the information he presented.
"Trust is at the core of the relationship between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This error had the possibility to damage the very considerable degrees of trust that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from iPlayer in the month of February after the boy's personal associations emerged, and in July an corporation's own inquiry concluded it infringed the organization's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the sanction as soon as the date and wording are determined."
