Materialized View Error 8908

Microsoft SQL Server 2005 - 9.00.1187.07

dbcc checkdb is failing with an interesting message:

Msg 8908, Level 16, State 1, Line 1

Indexed view 'BritishEnglishMV' (object ID 226099846) does not contain all rows that the view definition produces. Refer to Books Online for more information on this error. This does not necessarily represent an integrity issue with the data in this database.

The data materialized in the indexed view is exactly the same as the data in the underlying tables...
Books online has no info on this error.
Rebuilding the index fixes the problem.

This warning is produced if the indexed view does not 100% match the "newly generated" indexed view. This may happen in cases when there are updates performed on the underlying tables.
I will use an example to explain. If a view contains for examle an aggregation SUM, then inserting of new value to underlying table will add a new value to this sum. If the SUM was produced originally from a sequence of numbers, say a1, a2, ..., an, and the new inserted value is bb, then updating the indexed view means
(a1+a2+a3+...+an) + bb while recalculating the indexed view may prform the sum in different order.
We are still working on providing more information about warnings and errors we generate. This should improve substantially by the time we ship the final release of SQL Server 2005.

Lubor Kollar