How To Fix CNV127 - Activity can only be opened in read-only mode

CNV127 - Overview

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 127

• Message text: Activity can only be opened in read-only mode

What causes this issue?

You cannot execute this activity, as certain prerequisites have not been
met. For example, predecessor activities may be required, or the current
phase may be different to the phase to which this activity belongs.
You can open the activity in read-only mode, but you cannot make any
changes.

Error message extract from SAP system. Copyright SAP SE.

CNV127 - Details

• The SAP error message CNV127 ("Activity can only be opened in read-only mode") typically occurs in the context of SAP's data migration or conversion tools, particularly when using the SAP S/4HANA Migration Cockpit or other related tools. This error indicates that the activity you are trying to access is currently locked for editing, and you can only view it in read-only mode.
  Causes:
  
  Activity Locking: The activity you are trying to access may be locked by another user or process. This can happen if someone else is currently working on the same activity or if the system has locked it for some reason.
  User Permissions: Your user role may not have the necessary permissions to edit the activity. You might only have read access.
  System Configuration: The system might be configured to allow only read access to certain activities to prevent unintentional changes during critical processes.
  Technical Issues: There could be underlying technical issues or