The BBC committed a "major breach" of industry standards by omitting to mention that the presenter of a film about the Gaza situation was the child of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The authority has instructed the corporation to transmit a peak-time statement about its findings.
"Since this amounts to a major infringement of our code, we are instructing the broadcaster to transmit a announcement of our determinations against it on BBC Two at 21:00, with a date to be determined," it said.
'Possibility to Damage Credibility'
The regulator's statement said: "The inquiry we conducted found that the film's failure to disclose that the voice's father occupied a role in the Hamas-run administration was materially misleading.
"This implied that the viewers did not have critical information which may have been very significant to their evaluation of the narrator and the information he presented.
"Confidence is at the heart of the bond between a broadcaster and its public, especially for a public service broadcaster such as the public broadcaster.
"This error had the risk to erode the significantly high amounts of confidence that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the boy's family links were revealed, and in the month of July an internal BBC review concluded it infringed the organization's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in line with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will comply with the sanction as soon as the date and language are determined."
