Bill loops occur when a bill is assigned as a component to itself somewhere in the multilevel structure of the bill. The loop check program searches for such loops.
The Check for Loops program can be run from the Tools menu of the Bills of Material window.
Navigate to the Bills of Material window.
Note: The Check for Loops item on the Tools menu is only available when creating a new bill, after that new bill has been saved.
Choose Check for Loops from the Tools menu.