Kofax TotalAgility - Composite Activity throws error "Object with id xxx was not found in the repository" when document variable is passed in

Issue

A Composite activity suspends with the below error when a document variable is passed into it

Object with id xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx was not found in the repository.

Cause

When using a Composite node with a Classification step, it should not be possible to map a document variable at design time.  The fact this is possible is a bug which has been raised with the below reference.

Bug 1536406:Composite Activity throws error "Object with id xxx was not found in the repository" when document variable is passed in

Solution

The solution is to pass a folder variable into the Composite node instead of a document variable.