Be careful when copying the Find and Exist methods to other tables as a template. As they are static, the methods can technically be on any class or table—that is, check the return type. This can cause some confusion when they behave strangely. As EDTs can be used interchangeably, we won't get a type error unless the base type of the EDT is different. This means that you could pass a variable of the ConVMSVehicleGroupId type to InventItemGroup::Find() and it would simply return a record (or empty buffer) of the InventItemGroup type. So, if we copied the Find method from InventItemGroup to our table, the following scenarios would be possible:
| Code | Result |
| ConVMSVehicleGroup group = CustGroup::find(_VehGroupId); | This would cause a compilation error, as you can't assign an object of the CustGroup type to the ConVMSVehicleGroup type. |
| return CustGroup::find(_vehGroupId).Name; | This would compile without error as the compiler only checks that the base type is correct. ConVMSVehicleGroupId and CustGroupId are both strings. It will just not behave as expected and will return an empty string as the customer group record will not be found: records are never null. |