You may have read that in other blogs: Microsoft has released the SP1 for Dynamics AX 4.0 today.
You can download it from Partnersource (if you are a partner) or CustomerSource (if you are a north american customer).
All others (like me) cannot download directly but must contact their Axapta partner.
Development tutorial: SysExtension framework in factory methods where the constructor requires one or more arguments
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