Child Blueprint isn't listed as an option for a variable inside of a DataTable until the Child BP is re-saved
User Description:
If you don't change anything and just load files I've attached, you will notice that you can't select "TestBPClass3" in a variable despite "TestBPClass3" having "TestBPClass2" as a parent.
1. Open the attached test project
2. Open 'DataTable01'
3. In the Row Editor, click the dropdown of the variable and attempt to select 'BP_Child_Actor02'
Results: The 'BP_Child_Actor02' will not be listed until the DataTable is closed and the BP is saved
Expected: For 'BP_Child_Actor02' to be an option to choose
Head over to the existing Questions & Answers thread and let us know what's up.