Issues concerning X++

This link will show you how to resolve compiler warnings in Axapta.

http://blogs.msdn.com/x/

Dynamics AX Programming of Basic Methods of Tables

this is very nice link for basic level understanding
http://msdax.blogspot.com/2007/07/programming-of-basic-methods-of-tables.html

Code Coverage of Table Level Methods

In order to enable code coverage you have to follow some naming conventions or override a specific method on your test class:Naming convention: TableName + Test or simply override the testsElementName() method and returnthe name of your table.(also, override the testsElementType and return UtilElementType::Table;