Hi Naren,

"Error closing the transaction to the database" may occur when Outsystems is attempting to execute a query in the Outsystems database itself and also at many times when we will access other SQL environments like on Amazon, but in other regions .

To resolve this issue you need to forward this to your Environment Infrastructure team. They might do some firewall changes like increasing a timeout. They may need to increase the timeout using below steps :
Configuration tool -> Database section -> Advanced settings to increase "Connection timeout" value.  

You can find more detail about Configuration tool here https://success.outsystems.com/Documentation/11/Reference/Configuration_Tool

Also if  you need to learn more about Outsystem Transaction you can use below links:

https://www.outsystems.com/forums/discussion/2830/transactions-in-the-outsystems-platform/

https://www.outsystems.com/help/SErviceStudio/9.0/default.htm#Using_Data/Handling_Transactions.htm

Regards,

Rashmi

Thanks ,We already tried this and it didn't worked for us.