Assign a Column value to a Variable CRM Source

Hi,

I have a CRM application and i am pulling data using FETCH XML wrinting in Kingsway soft CRM source Editor (SSIS).

I am trying to save the value in a variable and use in later dataflow or connection manager set up for destination. I am having trouble assigning values to variable. Please help me on this.

I tried using below.

<fetch version="1.0" mapping="logical" aggregate="true">

 <entity name=@[User::tablename]>

   <attribute name=@[User::ColumnName] alias=@[User::tableAlias] aggregate="countcolumn" />

 </entity>

</fetch>