From the assembly editor, you can open and edit a component's implementation.
The component's implementation executes the business logic of the service.
Prerequisite:The implementation of the component has to exist
before you can open it. If the component has an exclamation mark in the lower
left corner, then its implementation has not been created. For example, the
following image shows a component that has a business process implementation
type but
the implementation has
not been created:

The
following image shows a process component and its implementation has been
created:

To open a component's implementation while you are working with the
assembly editor, double-click the component on the canvas or right-click
to select Open. The implementation is opened for editing.
If there is no implementation for the component, you will get a message asking
if you want to create a new one.