Function not possible - incorrect cursor position

What causes this issue?

To display the primary key or index fields, the cursor must be placed
on a primary key or an index.

System Response

Processing continues after the error message.

How to fix this error?

Place the cursor on a primary key or an index.

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.