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rdisp/rfc_min_wait_dia_wp 
Number of work processes kept free for other users.
This parameter is used to reserve a number of dialog work processes for dialog mode. It prevents parallel RFCs from occupying all the processes.
The parameter rdisp/wp_no_dia specifies the absolute number of dialog work processes.
Unit: number of dialog work processes
Default value: 1
If 10 dialog work processes are configured for the instance (rdisp/wp_no_dia = 10) and the parameter rdisp/rfc_min_wait_dia_wp = 3 is set, parallel RFCs can occupy a maximun of 7 dialog work processes. Three dialog work processes always remain free for dialog mode.
