mysql - Composite key with auto generated column in Fluent NHibernate -

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i have table in mysql database this:

certificateyear char(4) (pk) certificatenumber int autoincrement (pk) ... other fields

the key composite one. i've used configuration have field (certificatenumber) resets every year. whenever certificateyear changes, certificatenumber resets , starts 1. problem on mapping in fluent nhibernate. far, i've done in classmap:

compositeid()     .keyproperty(x => x.certificateyear, "certificateyear")     .keyproperty(x => x.certificatenumber, "certificatenumber");

when saving entity set value certificateyear , leave certificatenumber unset, don't know how nhibernate certificatenumber auto-generated. assigns value of 0 it, , complains duplicate key... question is: there way tell nhibernate certificatenumber, part of composite key, autogenerated?


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