Change a filed attribute during execution.

Hi everyone,

does anyone knows how to change the attribute of a field during execution of the application CRMD_BUS2000126 (Activities)?.

In the IMG(Transaction crmc_blueprint_c) i defined new field under application crmd_bus2000126 where i specified if i wanted my field to be changeable or not. I also created a new class based on the superclass CL_CRM_BSP_AM_HEADFM_1O where i inserted some code.

Now, depending in which mode( creation or modification ) the user is, i want to set my field changeable or not.

Does anyone knows how to do it?

THANKS,