At the bottom of the Automation tab of the User Options is an option to "Enable Relationship Construction on Alignment".
By default, SA automatically builds relationships to help a user identify the quality of an alignment, verify that an alignment has or has not been altered, and repeat that alignment as needed. Automatic relationship construction is integrated in the following alignment operations:
Best Fit - builds a Group to Nominal Group relationship, we would also want to add an option to execute a measure nominal alignment to the option of a Group to Nominal Group
Quick Align to CAD - builds a Points to Surface Faces relationship.
Cloud to CAD alignment - builds a Cloud to CAD relationship
This option was added to support MP operations that do not want to this automatic action to take place.