SAP Message UCF8017 - Value for key characteristic &1 is not defined or ambiguous

Diagnosis
The values of all key characteristics must be unambiguous whenselecting a document. However, either no value was specified for keycharacteristic &V1&, or the selection allows for multiple values. Thecurrent specification cannot identify a unique document.

System Response
Document selection terminated.

Procedure
Specify the selection parameters so that they identify exactly onedocument.