To generate a script for an object, you must pass up to six parameters:
exec proc_genscript @ServerName = 'Server Name', @DBName = 'Database Name', @ObjectName = 'Object Name to generate script for', @ObjectType = 'Object Type', @TableName = 'Parent table name for index and trigger', @ScriptFile = 'File name to save the script'
http://www.databasejournal.com/features/mssql/article.php/2205291
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