Customer-Specific Implementation of Pushbutton for Triggering Calculation 
To implement the triggering of calculation, or to reset the trigger with customer-specific requirements, you must replace the following two processes in Customizing for the process framework:
QCAL: Trigger calculation (class CL_CRM_IU_PR_QUOT_CALC & CL_CRM_IU_PR_QUOT_CALC_HD)
QCAR: Reset trigger (class CL_CRM_IU_PR_QUOT_CALC_R & CL_CRM_IU_PR_QUOT_CALC_RHD)
If you delete these two processes from your process profile, the two pushbuttons no longer appear on the interface.
For more information about the processes, see the process framework documentation.