SAP Message UAMO016 - Enter a value in field "&1"

Diagnosis
You have created or changed an object in the working environment or inthe main tree, but the key of this object is not completely defined.First you must maintain all key fields of the object before you cancontinue working. At present, the entry on the field "&v1&" is stillmissing.

Procedure
Enter the missing value in the field "&v1&" of the object key. Othervalues are also possibly missing in the object key. The system willpoint this out to you if necessary.
If you do not see a column for field "&v1&" in the working environmentor in the main tree, this is likely because a layout has been specifiedin which this field is hidden. In this case, choose a layout whichcontains field "&v1&".
If you want to delete the object that has been created, choose the"Delete" button.