Select only one entry

What causes this issue?

You have chosen the function for displaying an object (document). You
have selected either no objects (documents) or more than one.

System Response

The system cannot decide which object (document) you want to display.
It cannot therefore execute the function.

How to fix this error?

Only mark one object (document), that is, just one line. Alternatively,
you can call up the object you want to display by double-clicking on
it.

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.