W1009 Redeclaration of '%s' hides a member in the base class (Object Pascal)
A property has been created in a class with the same name of a variable contained in one of the base classes. One possible, and not altogether apparent, reason for getting this error is that a new version of the base class hierarchy has been installed and it contains new member variables which have names identical to your properties' names. -W
(*$WARNINGS ON*) program Produce; type Base = class v : integer; end; Derived = class (Base) ch : char; property v : char read ch write ch; end; begin end.
Derived.v overrides, and thus hides, Base.v; it will not be possible to access Base.v in any variable of type Derived without a typecast.
(*$WARNINGS ON*) program Solve; type Base = class v : integer; end; Derived = class (Base) ch : char; property chV : char read ch write ch; end; begin end.
By changing the name of the property in the derived class, the error is alleviated.