How To Fix SY430 - Unable to debug ABAP programs at the moment

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 430

• Message text: Unable to debug ABAP programs at the moment

What causes this issue?

The dialog work process cannot switch to debugging mode at the moment,
because the maximum number of work processes working in this mode has
already been reached.

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

You are working in a production system or client (see table T000)
You may only debug in these clients if the work process is in debugging
mode. Otherwise, the system would have to COMMIT WORK. For security
reasons, you do not want this to happen.
Dialog work processes in debugging mode are assigned to a single user;
this protects the user context from process changes. However, user
contexts are usually rolled out of the old workprocess when the system
is waiting for user input, and prepared to be rolled into a new work
processes. This makey a COMMIT WORK necessary.
Work processes in debugging mode cannot be used by other users, and so
the number of free dialog work processes is reduced. This affects
system performance. For this reason, each system has a maximum number
of work processes that may be in debugging mode at any one time.

System Response

How to fix this error?

Try using the ABAP Debugger again later. The work process may then be
able to switch to debugging mode.
The process overview shows you which processes are currently in
debugging mode.
No more than half of all dialog work processes may be in debugging mode
at any time.

Error message extract from SAP system. Copyright SAP SE.