Are you are using the same iTunes account for purchasing the style that you used when purchasing iReal book?
If so, then you could try uninstalling iReal book then 'buying' it again, if you have bought it with the same iTunes account it will not charge you, then try purchasing the style pack again.
- Uninstall instructions in this thread:
http://irealb.com/forums/showthread....=3291#post3291
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