Why does global initializers need to be constant?

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Tibit
 #1
Type Test
Global List = New TList 'Error
Field List = New TList 'Works
EndType

Also can someone explain this:
Type Test
  Field List = New TList
  Field Flag = Add( 30 )
  Field TestField:Test = Create( 1 )

	Function Create:Test( Flag )
		NewTest:Test = New Test
		NewTest.Flag = Flag
		Return NewTest
	EndFunction
	
EndType

Print "START"
T:Test = New Test
Print T.Flag
Print T.TestField.Flag


Function Add( T# )
	Return T#+10
EndFunction


The function Add being called in the type as default value works with no problem but when it returns a type it exits with no error.

Samething about globals is that they does not work with a create function. Why do globals need to be constant in type initziation?