The field & is not ready for input and was therefore not transferred

What causes this issue?

When transferring data by <DS:GLOS.direct_input>direct input</> or
distributing data by <DS:GLOS.Application_Link_Enabling>application
link enabling</> (ALE), you can change only those fields that can also
be maintained in online mode. Since the field &V1& cannot be maintained
in online mode, it could not be transferred.

System Response

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

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.