The copy run chosen was canceled (possible timeout or DB error)

What causes this issue?

The client copy run was terminated from outside.

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

System Response

This can have different causes:
1. Probably the runtime was exceeded. You might get an ABAP dump with
the error cause Time-out.
2. The program was stopped by a user.
3. The program terminated due to an error in an EXIT module. You get an
ABAP dump.
4. The SAP System was stopped.
5. There was an inconsistency of the database with the SAP System
(nametab). You get an ABAP error message referring to a database
inconsistency.
The log of the client copy (transaction SCC3) contains the information
where the error occurred. The last phase to be edited and the last exit
program (for N? phases) or the last table edited (for C? phases) is of
importance.

How to fix this error?

Proceed as follows to solve this problem:
1., 2., 4. Start the client copy in restart mode.
3. Look for a Note about the last exit program in the Note system.
Correct the error in the exit module and start the client copy in
restart mode.
5. In the ABAP error message find out the table in which the error
occurred. Correct the error using the ABAP/4 Dictionary and start the
client copy in restart mode.

Error message extract from SAP system. Copyright SAP SE.