Yes, it should be #{branchHome.instance}. Thanks a lot for the help. And now 
invoking #{categoryHome.loadCategoriesByBranchId(branchHome.instance.id)} 
method works fine :)

But I still don't understand why I should use a:region and a:outputPanel. I 
don't use any of them and the second selectOneMenu is refreshed without a 
problem after the loadCategoriesByBranchId(branchHome.instance.id) method is 
invoked. Could you explain the aim of using that components in detail, please?

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