Machine Enhancements

• Prevent unlinking of represented assembly part with represented children.
• Test three level of hierarchy.
• Test functionality for machines with template.
• Test functionality for machines without template.

Catalog (does not touch the machine element) :

• Support removal of parent element
• Support replacement of parent element catalog reference.
• Support removal of represented element.
• Support assembly swap of parent element

Other:

• Ensure circular reference not possible