Constraint
These are the constraints:
  - Ballooning is done only for Top-Level components.
 - When there exist multiple drawings in the system for the same [model + configuration], the information in PLM is overwritten with the ballooning information of last saved document.
 - If ballooning is not performed for a document, then the information in PLM is not updated.
 - You must first create a Top-Level BOM Table and then perform automatic balloon creation.
 - Only Balloon information linked to the top level Item is mapped.
 - If balloons are mapped to the Find No. field in PLM, user is responsible to prevent duplicate numbers. In case of duplicate Find No, an error message is displayed.