How To Fix W/168 - Maximum number of processes must be greater than 0

SAP Error Message - Details

• Message type: E = Error

• Message class: W/ -

• Message number: 168

• Message text: Maximum number of processes must be greater than 0

Self-Explanatory Message

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• What is the cause and solution for SAP error message W/168 - Maximum number of processes must be greater than 0 ?

  The SAP error message:
  W/168 Maximum number of processes must be greater than 0
  
  Cause:
  This warning message occurs when the system parameter that controls the maximum number of work processes is set to zero or a negative value. In SAP, the maximum number of work processes must be a positive integer greater than zero. If it is set to zero or less, the system cannot allocate any work processes, which leads to this warning.
  Typically, this parameter is:
  
  rdisp/wp_max_no — Maximum number of work processes.
  
  If this parameter is incorrectly set to 0 or a negative number, SAP raises this warning.
  
  Solution:
  
  
  Check the parameter value:
  
  Go to transaction RZ10 (Edit Profile Parameters) or RZ11 (Display Profile Parameter).
  Look for the parameter rdisp/wp_max_no.
  Verify its current value.
  
  
  
  Set a valid value:
  
  The value must be a positive integer, typically between 2 and 128 depending on your system size and workload.
  For example, set rdisp/wp_max_no = 10 (or an appropriate number based on your system sizing).
  
  
  
  Apply the change:
  
  If you changed the parameter in RZ10, save and activate the profile.
  Restart the SAP instance for the parameter change to take effect.
  
  
  
  Verify:
  
  After restart, check the system log (transaction SM21) or system status to confirm the warning no longer appears.
  Also, verify the number of work processes in transaction SM50.
  
  
  
  
  Related Information:
  
  Parameter rdisp/wp_max_no: Controls the maximum number of dialog work processes.
  Other related parameters:
  
  rdisp/wp_no_dia — Number of dialog work processes.
  rdisp/wp_no_btc — Number of background work processes.
  
  
  Setting this parameter too low can cause system performance issues because there will be insufficient work processes to handle user requests.
  Setting it too high can consume excessive system resources.
  Always size the number of work processes according to your system workload and hardware capacity.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error message
  W/168 Maximum number of processes must be greater than 0
  
  
  Cause
  Parameter rdisp/wp_max_no set to 0 or negative value
  
  
  Solution
  Set rdisp/wp_max_no to a positive integer > 0 in RZ10, then restart SAP instance
  
  
  Related info
  Check other work process parameters; size according to workload
  
  
  
  
  If you need help determining the optimal number of work processes, SAP notes and sizing guides can provide recommendations based on your system type and usage.