The Asset Manager is an Open Source Asset Management System. Asset Manager was made for IT asset management, to enable IT departments to track who has which laptop, when it was purchased, which software licenses and accessories are available, and so on.
When you extend Entity class then the class automatically inherit Id property, which is used as a primary key. You shouldn't have declare Id property manually. Please remove those duplicate Id declaration.
When you extend
Entityclass then the class automatically inheritIdproperty, which is used as a primary key. You shouldn't have declareIdproperty manually. Please remove those duplicateIddeclaration.