The BBC engaged in a "serious breach" of industry standards by omitting to mention that the voice of a programme about the Gaza situation was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to accuracy".
The authority has instructed the broadcaster to air a prime-time announcement about its findings.
"As this represents a serious breach of our rules, we are ordering the BBC to broadcast a statement of our findings against it on BBC Two at 21:00, with a schedule to be determined," the statement read.
'Potential to Erode Confidence'
The authority's report declared: "Our investigation concluded that the documentary's lack of disclosure that the narrator's parent held a position in the Hamas-administered administration was materially misleading.
"Consequently that the audience did not have essential details which may have been highly relevant to their assessment of the presenter and the information he presented.
"Trust is at the center of the bond between a media organization and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to damage the significantly high amounts of trust that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from iPlayer in the month of February after the boy's family links came to light, and in this past July an broadcaster's internal assessment found it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The regulator's decision is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and wording are determined."
