BADI for Updating work order component data

Hi,

I need to update the field special stock indicator for the work order component data when it is saved. I am using the BADI WORKORDER_UPDATE for the same, but when I implemented the ZWORKORDER_UPDATE_IM using the standard defenition  WORKORDER_UPDATE , the code does not allow me to change the it_component internal table belonging to the BEFORE_UPDATE method. Could you please help me in this.

Basically if we are implementing a standard defenition how to change the parameters of the methods in it.

Regards,

Prabaharan.G