Task list & / & is inconsistent due to duplicated operation numbers

What causes this issue?

You have added to this task list at least one operation or suboperation
that already exists in another version of the task list.
An operation or suboperation must have one unique number in the lifetime
of a task list. This number cannot exist twice.

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

System Response

The system cannot save this task list with this inconsistency in the
operation numbers.

How to fix this error?

Use unique numbers for operations and suboperations. Check the operation
numbers against the operation numbers of other task list versions, to
see
whether the numbers have already been used. Do not use any numbers more
than once.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.