SAP Message AY817 - Overview of totals of several subnumbers is currently not possible

Diagnosis
You entered '*' as the sub-number of an asset in order to see the totalof all sub-numbers belonging to the asset.

System Response
It is not possible for the system to total the sub-numbers at thepresent time. The system continues processing at sub-number 0.

Procedure
To display the total of all sub-numbers, use transaction AW01.
Proceed