The public service broadcaster engaged in a "significant breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
The regulator has directed the broadcaster to transmit a peak-time declaration about its decisions.
"Since this amounts to a significant violation of our code, we are directing the corporation to air a announcement of our determinations against it on the BBC's second channel at 21:00, with a timing to be confirmed," it said.
'Potential to Undermine Credibility'
The regulator's report stated: "Our probe determined that the programme's lack of disclosure that the presenter's parent occupied a role in the Hamas-administered administration was materially misleading.
"This implied that the audience did not have essential details which may have been highly relevant to their evaluation of the narrator and the information he presented.
"Confidence is at the center of the relationship between a media organization and its public, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to erode the exceptionally strong levels of credibility 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 February after the boy's family links were revealed, and in the month of July an internal BBC review concluded it violated the organization's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will comply with the directive as soon as the date and language are determined."
