The syntax of the semantic key is invalid.

What causes this issue?

The syntax of the semantic key annotation is invalid.

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?

Correct the syntax of the semantic key annotation in the CDS view.

Procedure for System Administrators

Contact the corresponding developer of the CDS view to correct the
error.

Error message extract from SAP system. Copyright SAP SE.