The public service broadcaster engaged in a "major breach" of industry standards by omitting to mention that the voice 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 Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
The authority has directed the broadcaster to air a evening statement about its decisions.
"As this represents a serious breach of our code, we are instructing the BBC to broadcast a announcement of our conclusions against it on the BBC's second channel at 9pm, with a timing to be determined," the statement read.
'Risk to Undermine Confidence'
The regulator's report declared: "Our investigation determined that the programme's failure to disclose that the narrator's parent held a post in the Hamas-controlled administration was significantly deceptive.
"This implied that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the content he presented.
"Confidence is at the heart of the bond between a media organization and its audience, especially for a state-funded media outlet such as the BBC.
"This error had the risk to damage the very considerable amounts of trust that the public would have put in a BBC factual programme about the Gaza conflict."
The programme was pulled from iPlayer in February after the narrator's family links were revealed, and in the month of July an internal BBC review found it violated the corporation's journalistic standards on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in full. We will adhere to the sanction as soon as the schedule and language are determined."
