When we rename a BP, or move a BP to another folder, sometimes it will be corrupted, and not able to open and edit, The BP asset shows its parent as "None".

This tool allows you to reparent a corrupted BP to a new parent without restarting the editor.

Solution 1

this is the most common way

• using [CoreRedirects], put it in the DefaultEngine.ini

  [CoreRedirects]
    +ClassRedirects=(OldName="Pawn",NewName="MyPawn",InstanceOnly=true)
    +ClassRedirects=(OldName="/Script/MyModule.MyOldClass",NewName="/Script/MyModule.MyNewClass")
    +ClassRedirects=(OldName="PointLightComponent",NewName="PointLightComponent",ValueChanges=(("PointLightComponent0","LightComponent0")))
    +ClassRedirects=(OldName="AnimNotify_PlayParticleEffect_C",NewName="/Script/Engine.AnimNotify_PlayParticleEffect",OverrideClassName="/Script/CoreUObject.Class")
    
    +EnumRedirects=(OldName="ENumbers",NewName="ELetters",ValueChanges=(("NumberTwo","LetterB"),("NumberThree","LetterC")))
  
    +PackageRedirects=(OldName="OldPlugin",NewName="/NewPlugin/",MatchSubstring=true)
    +PackageRedirects=(OldName="/Game/DeletedContentPackage",Removed=true)
    +FunctionRedirects=(OldName="MyOldActor.OldFunction",NewName="MyNewActor.NewFunction")
    +FunctionRedirects=(OldName="MyActor.OldFunction",NewName="NewFunction")  
    +StructRedirects=(OldName="MyStruct",NewName="MyNewStruct")

• then reopen Unreal Editor, the BP will be fixed

• open the BP and save it, now we can remove the [CoreRedirects]

• or just using "Update Redirector References" button

Solution 2

This solution allows you to reparent a corrupted BP to a new parent without restarting the editor

• Using Editor Utility Blueprints
• create a new Editor Utility Blueprint from Asset Action Utily
• add a new function named "Reparent"

uebp

• select the BP you want to fix, click the "Reparent" button at Scripted Asset Actions

Reference

• core redirects

• https://dev.epicgames.com/community/learning/tutorials/owYv/unreal-engine-getting-started-with-editor-utility-blueprints