The British broadcaster engaged in a "significant breach" of industry standards by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas administrator, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
The regulator has instructed the BBC to broadcast a evening declaration about its decisions.
"As this represents a serious breach of our code, we are instructing the corporation to broadcast a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Erode Trust'
The regulator's report declared: "Our investigation found that the programme's lack of disclosure that the voice's father held a position in the Hamas-run administration was significantly deceptive.
"It meant that the audience did not have vital facts which may have been highly relevant to their judgment of the narrator and the information he provided.
"Credibility is at the heart of the relationship between a television network and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to damage the significantly high amounts of confidence that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in February after the narrator's family links emerged, and in July an internal BBC review concluded it violated the organization's content policies on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in full. We will comply with the penalty as soon as the schedule and language are determined."
