HDL updates

Summary

we need to delete or mask the national identifier.

Content

Hi, 

we need to delete or mask the national identifier. 

I prepare the following HDL.

METADATA|PersonNationalIdentifier|SourceSystemOwner|SourceSystemId
DELETE|PersonNationalIdentifier|LEGACY|VTV_PERSON_NI_3_RFC_MXL10794

I receive the error 

A parent for this record was not found. Use any of the four supported key-resolution systems to supply a valid parent reference.

Can you help me to solve it?

Thanks 

Nicola