"VS_NEEDSNEWMETADATA" error while running a package created from C# code

Question

I have gone through most of the answers for similar questions here however none has resolved the issue. We have created a package using C# code which stages data from a source table to destination (ChildPackage.dtsx).
Source Table : RowKey, Col1, Col2
Destination Table : RowKey, Col1, Col2, RowID, RunID (RowID is an identity column in destination table and RunID is a derived column whose value is set using a variable)
This package runs fine when we execute it directly however, we run these packages from a master package (MasterPackage.dtsx). When we are trying to run the package (ChildPackage) from a MasterPackage we get an error:
[SSIS.Pipeline] Error: "Oledb Destination" failed validation and returned validation status "VS_NEEDSNEWMETADATA".
We have tried setting DelayValidation to true for the ChildPackage and even tried setting the values for "ValidateExternalMetadata" for the source and destination component as "False" for the data flow task
of the ChildPackage.
There is no case difference between column names in source and destination and it runs fine when we run the ChildPackage directly.
The only additional task that the Master package performs is to generate and set a variable that is used as RunID value by the child package.
If we hardcode the RunID in the ChildPackage and run it directly, it runs fine.
The MasterPackage.dtsx is not created from code and has a step to run ChildPackage.dtsx. We generate the ChildPackage.dtsx from code and replace in original solution.
Any help would be appreciated.
Gaurav Agarwal

Answer 1

Where then this RunID is consumed?
Arthur My Blog
The RunID is set by the MasterPackage in a parameter, this parameter is used as value of derived column in the data transformation task of the ChildPackage.
As mentioned ChildPackage has a RunID column.
Gaurav Agarwal