Cannot delete an assembly item even if there are no related records.

Check if there are item revisions created for the components of the assembly. To resolve, please follow steps below:

1. Edit the assembly item.
2. On the Purchasing/Inventory tab > Components subtab, remove the value from the Effective Revision column.
3. Click Save.

To double check the items which have item revisions created, user may navigate to Lists > Supply Chain > Item Revisions.