Restore Outstanding objects in a custom table?

We tried to do that but we created an "DateOutstanding" column instead. Set ExitDate to Today() if it is missing and remove it (or set it to a future date) if it returns.

Alright, how do you detect that it's missing?

Either through SQL-statement or through the SyncEditor..

I might be stupid, but I can't find a way to process or update objects that are missing except for setting either Mark as outstanding or Delete. 

No, you're not stupid. I believe you can create a script that is formatted a special way that you then can select in the sync editor.

<Tag("Projector")>
<BaseObjectType("Person")>
Public Sub CCC_Person_RemoveCompany(unit As IUnitOfWork, entities As IEntity())
   For Each currEntity As IEntity In entities
      If Not String.IsNullOrEmpty(currEntity.GetValue("CompanyMember").ToString()) Then
         currEntity.PutValue("CompanyMember", "")
         unit.Put(currEntity)
      End If 
   Next
End Sub

No, you're not stupid. I believe you can create a script that is formatted a special way that you then can select in the sync editor.

<Tag("Projector")>
<BaseObjectType("Person")>
Public Sub CCC_Person_RemoveCompany(unit As IUnitOfWork, entities As IEntity())
   For Each currEntity As IEntity In entities
      If Not String.IsNullOrEmpty(currEntity.GetValue("CompanyMember").ToString()) Then
         currEntity.PutValue("CompanyMember", "")
         unit.Put(currEntity)
      End If 
   Next
End Sub

Hello Dan and Hendrik ;-)

Not to be butting in or anything. I could be completely misinterpreting the issue, then ignore this post.
But I think you could use this OOTB option to unmark the outstanding objects in the sync project.

Workflow > Processing > Object with modified properties:
[+] Add method: Remove deletion flag (with the condition: BaseIsOutstanding='True')
and place this method above the 'Update object' method
Look at the Workflow of the User object in your AD sync as an example.

You're not butting in..

Thank you. That sounds like the best method right now.
And thank you henrik a johansson for your suggestions as well.