The BBC's governing body has partially agreed with a complaint about Michael Palin's New Europe: War and Peace.
One viewer felt the programme gave an "inaccurate" account of the Balkan Wars of the 90s and entered into the realm of "political commentary".
The BBC Trust said the programme makers should have taken "greater care to ensure accuracy" but concluded the show had not had a political message.
It said non-news shows should remember the importance of checking facts.
The complainant questioned Palin's comments concerning the destruction of the old bridge at Mostar.
It was also claimed the commentary suggested that Serbia was unfairly blamed for all the region's troubles.
The complaint was partially upheld with regard to accuracy and impartiality.
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