I googled and saw this https://www.drupal.org/node/2342699 where it is 
stated that SqlContentEntityStorage::mapToStorageRecord sends update 
statements that includes IDENTITY fields that need to be updated, such as: 
UPDATE xxx SET nid = 1, property0 = :value0 WHERE nid = 1;. This is not 
supported in SQL Server because although there is no actual update 
happening it is explicitly telling the database engine that you wish to 
perform an update.

and here https://www.drupal.org/node/2090251  it is said The underlying 
problem is that MySQL accepts identity updates (when there are no changes) 
but Sql Server being properly designed complains with this bad practice.

Is this the issue in web2py also.
 

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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