Clement
Assuming all currency fields in your database have the "money" data type, this will generate a script that will change your values as required.
John
SELECT 'UPDATE ' + c.TABLE_NAME + ' SET ' + c.COLUMN_NAME + ' = ' + c.COLUMN_NAME + '/1000.000'
FROM INFORMATION_SCHEMA.COLUMNS c JOIN INFORMATION_SCHEMA.TABLES t
ON c.TABLE_NAME = t.TABLE_NAME
WHERE c.DATA_TYPE = 'money'
AND t.TABLE_TYPE = 'BASE TABLE'