Registered read-only object changed in parallel

What causes this issue?

An object registered as read-only in the simulation has also changed in
a parallel transaction.

System Response

How to fix this error?

Use the Softmerge mode (instead of VerySoftMerge) to import the
simulation back to the real data. This mode does not include a check for
parallel changes.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.