Why won't it let me delete a record?

The system may not let you delete a record because there is still data attached. The system won't allow you to delete unless everything attached to the record has been deleted.

If you wish to delete a record off the system entirely, you will need to delete all data attributed to that record first i.e. match potentials, investigations and flagged matches etc.
 
Once you have deleted all the attached data to a record, you will then be able to delete the full record.