How To Fix TPDA350 - No exclusive debugging mode available

SAP Error Message - Details

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 350

• Message text: No exclusive debugging mode available

What causes this issue?

In "Non-Exclusive Mode", the ABAP Debugger was unable to reserve a
work process exclusively for this debugging session. 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?

In the meantime, a work process may have become free for exclusive use
by the Debugger, so that you could try to switch to "Exclusive Mode" by
choosing "Debugger -> Exclusive Debugging Mode On" from the menu.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.