To correct the problem, you need to rename one or both of the entities so they both have exactly the same name. The easiest way to do this is:

1. Open the entity in FN. It doesn’t matter which folder or year, unless you can identify the entity with the bad name.
2. Select File | Change Entity Name. See Change Name on Reports.
3. Carefully enter the new name on the Change Entity Name screen. FN will use this name from now on.

Otherwise, you still will have two names. If you can find the folder with the FN data that has the second entity name, open it and change the name to match.
If you don’t know where the other name came from, follow the procedure for deleting an entity that has no data. For instructions, see Deleting Entities.

At some point in the future, you may open other FN data for this entity but get the message “The entity …is not currently on the entity list. Do you want to add this entity to the entity list?” Stop and think. You may want to select Cancel and display the entity list. If this really is the same entity, but with a typo or slightly different name, go ahead and open it. Rename it to the new name as above. If there are folders from other years, you may need to repeat this process.

The moral of the story is: Make sure an entity is not already on your FN entity list before you add it.

- David
FNI Support

The best thing to do at this point is to get both the duplicate entities off the list. We’ll do this by renaming one and deleting the other.

First, back up all your data. That’s always a good idea.

Then, follow the instructions above to change one of the entity names. If the old, duplicated name was "Silver Lining," change it to something different like "Silver Lining Two"

If the old name still appears on the entity list, delete that entity following the steps above, pretending like it has no data. Normally, when you delete an entity, the data for that entity is deleted also. Following these special steps for an entity without data allow you to delete the entity name, even if you aren’t sure what data goes with it.

Now there is one less entity on your list, since the duplicate is no longer there.

At this point, you can change Silver Lining Two back to the original name Silver Lining.

After this is all done, you may have data for the entity that still has some problem with the old name. When you open that data, FN will ask something like 'The entity Silver Lining is not currently on the entity list. Do you want to add this entity to the entity list?" Since that is the problematic old name that you just deleted, allow FN to add it to the list, then rename it to Silver Lining. Even though both names seem the same, this should correct the name so that it doesn’t appear as a duplicate. You still have the correct number of entities.

- David
FNI Support