Qatar banknote Reference [Risolto]

Hi,

Why are the numbers listed from P#1 to P#28, but then there are new listings under TBB#223 etc? Are these errors or is a new catalogue being used?

TBB is 'The Banknote Book (you can see the exact names when you hover your mouse over the abbreviations) the next standard reference as people say. Because there are no new Pick numbers those are the only available reference numbers for newer notes I guess.

Thanks!