Hi @Jens Scho ,
May I know your destination source? Is it also SQL Server or any other database?
If it is SQL Sever, could you please change the provider with SQLNCLI11 for a try?
Have you check the value of the parameter to make sure the format is correct?
Here is an article you may take a reference: parameterizing-database-connection-sql-server-integration-services
The Connection Strings Reference to check the connection string.
Regards,
Zoe
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