ValidateExternalMetadata property, what exactly does this do?

Question

I have a package which reads data from a table and based on a column value stores the records in two other tables. Package uses Transaction required property. It was running

Answer 1

This may be the explanation:

http://support.microsoft.com/kb/2253391

The execution of a SQL Server Integration Services (SSIS) package stops responding when you enable DTC transactions for a package in Microsoft SQL Server