How To Fix TPDA352 - Change rejected: There is currently no free exclusive debugging process

SAP Error Message - Details

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 352

• Message text: Change rejected: There is currently no free exclusive debugging process

What causes this issue?

The Debugger was unable to switch from "Non-Exclusive Mode" to
"Exclusive Mode". The reason for this is that all available work
processes were already in use with other debugging sessions.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Restrictions in "Non-Exclusive Mode":
For every Debugger interaction, a database commit must be triggered.
As a result:
- You cannot debug between "SELECT ... ENDSELECT" (short dump in
Debugger)
- If the debugging session is cancelled, the database content can become
inconsistent.
Since there can be no database inconsistencies in production systems,
the "Non-Exclusive Mode" is not possible there. Instead of starting the
Debugger in "Non-Exclusive Mode", the system triggers the short dump
"DEBUGGING_IMPOSSIBLE".
The number of work processes exclusively available for debugging in
production systems is defined in the profile parameter for the number of
dialog work processes as follows: "rdisp/wp_no_dia / 2"
In non-production systems, this number is set using the profile
parameter "rdisp/wpdbug_max_no". It is recommended that
"rdisp/wpdbug_max_no" is roughly equal to "rdisp/wp_no_dia / 2".
On the other hand, the default value "rdisp/wpdbug_max_no = 1"
is almost always too low.

System Response

How to fix this error?

Keep trying to activate the "Exclusive Mode" ("Debugger -> Exclusive
Debugging Mode On"). In the meantime, a work process may have become
free for exclusive use by the Debugger.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TPDA352 - Change rejected: There is currently no free exclusive debugging process ?

  The SAP error message TPDA352 indicates that a change request or transport request could not be processed because there are no available exclusive debugging processes. This typically occurs when the system is configured to allow only a limited number of debugging sessions, and all of them are currently in use.
  Cause:
  
  Limited Debugging Sessions: The SAP system has a limit on the number of exclusive debugging sessions that can be active at any given time. If all available sessions are occupied, new requests will be rejected.
  Long-Running Debugging Sessions: If a debugging session is taking too long to complete, it can block other requests from being processed.
  System Configuration: The system may be configured to restrict the number of concurrent debugging processes.
  
  Solution:
  
  
  End Existing Debugging Sessions: Check if there are any active debugging sessions that can be terminated. You can do this by:
  
  Using transaction SM50 (Process Overview) to identify and end long-running or unnecessary debugging sessions.
  Look for processes with the status "Debugging" and terminate them if they are no longer needed.
  
  
  
  Increase the Number of Debugging Processes: If your system frequently runs into this issue, consider increasing the number of allowed debugging processes. This can be done by:
  
  Modifying the instance profile parameters. You can adjust the parameter rdisp/wp_exclusive to allow more exclusive debugging processes.
  Note that this change requires appropriate authorization and should be done with caution, as it can impact system performance.
  
  
  
  Check for System Performance Issues: If debugging sessions are taking too long, investigate the underlying cause. It could be due to performance issues in the system or inefficient code being debugged.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes that might provide additional insights or solutions specific to your version of SAP.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM50: Process Overview
  SM66: Global Process Overview
  ST22: Dump Analysis (to check for any ABAP runtime errors)
  
  
  
  SAP Documentation: Refer to the official SAP documentation for more details on debugging processes and system configuration.
  
  
  Performance Monitoring: Regularly monitor system performance and debugging sessions to prevent this issue from recurring.
  
  
  By following these steps, you should be able to resolve the TPDA352 error and manage debugging sessions more effectively in your SAP environment.