Maintaining 3 Level of Account Hierarchy, how to Implement?

Hi,

We have a requirement of moving Accounts between the 3 Level Hierarchy

I.e., For eg: we have a Hierarchy as below

Hierarchy 1:

Parent 1 --> Child 1(Grand Child 1) & Child 2(Grand Child 2)

Hierarchy 2:

Parent 2 --> Child 3(Grand Child 3) & Child 4(Grand Child 4)

Now, I need to move Child 1(From Hierarchy 1) as Grand Child 5 below Child 4 (of Hierarchy2), but system should not allow because Child 1(From Hierarchy 1) has Grand Child 1( From Hierarchy 1).

Hence the requirement is I need to maintain only 3 level of Hierarchy and anything above below or above

Regards

Naresh