How to change protected attribute?

Hi all,
This is the situation:
In standard SAP there is an object OBJ_A with a protected attribute ATTR_P. The object has a getter method for the attribute, but no setter.
My requirement:
i need to manipulate/change the protected attribute ATTR_P.
what i've tried so far:
I created my own class CL_Z which inherits from the class of OBJ_A. Then i created a method CHANGE_ATTR_P.
In a BADI where the standard object OBJ_A is available i instantiated my z-object OBJ_Z.
With casting, referencing etc i tried to get to the protected attribute. but no luck.
has anyone any suggestions?
Thanks alot.
Joris Bots

> In a BADI where the standard object OBJ_A is
> available i instantiated my z-object OBJ_Z.
> With casting, referencing etc i tried to get to the
> protected attribute. but no luck.
If the BADI gives you an object which has the type of the parent class then you cannot cast it into the subclass type. I doubt that there is any chance to change the protected attribute because it might be protected for a reason.
It would work if the protected class implements an interface and the getter method is defined in the interface but that is not the case, correct?
cheers
Thomas

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