SAP Message WS316 - The volume unit of document &1 is missing (no statistical update)

Diagnosis
The statistical update for document &V1&, item &V2& was cancelled asthe volume unit is missing.

System Response
The statistical update is terminated to prevent statistical data beingdamaged.

Procedure
Please contact your R/3 system administrator, as this message is due toa program error.
The error occurred in function module &V3&.