Overview:
Unable to edit Master Detail relationships Offline. When the user attempts to change the relationship the lookup field is grayed out.
Root Cause:
This is not supported. Reparenting of child records or changing the Master Detail relationship in any of the offline platforms is not allowed.
Solution:
This is expected behavior. This Salesforce functionality is only supported online currently.
Related Documentation:
Salesforce Documentation: New Master-Detail Relationship Option
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