Validation issue when moving a node in a hierachy.

Summary:

Hi, I have a validation issue when moving a node in a hierachy. I have 2 Node Types, A and B, Node Type A can be on multiple levels, Node Type B can only be on a pre defined level, say 5 and Node Type A on 1-4. I need a validation to prevent Node Type B to be moved to a higher level than 5 when moving nodes above, like moving Note Type A and all ancesters from level 3 to 2.

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