Replace Component and Instance Attributes

Hello,

I have come across the following situation where instance attributes are not updated when replacing a component. I'm using NX7.5.3.3 x64.

Suppose I have two assemblies, A and D. A is structured as follows:

A
-B
--C

(A is the root occurrence, B is a child of A, and C is a child of B).

D is structured as follows:

D
-E
--F

(D is the root occurrence, E is a child of D, and F is a child of E).

So far, so good. Now let's turn it up at notch: Since B is an instance, I can supply an instance attribute. Let's call this attribute INSTANCE_ATTRIBUTE and give it a value of B. In order to visualize this instance attribute, I clone (e.g. copy) the attribute as an occurrence attribute, so I can keep track of it in the Assembly Navigator Tree (ANT). To visualize:

A
-B [INSTANCE_ATTRIBUTE = B]
--C

Now I repeat the process for instance E in assembly D:

D
-E [INSTANCE_ATTRIBUTE = E]
--F

Now for the fun part. Interactively I replace B (in assembly A) with E using the replace component command. My new assembly looks like this:

A
-E [INSTANCE_ATTRIBUTE = B]
--F

It still has the instance attribute of B! This does make
sense (on how instances work in NX), but what is the purpose?

I initially tried a similar test, but instead of replacing B with E, I used a different assembly,

G
-H

but then replaced B with G. Since G is the root occurrence, it has no instance, therefore no instance attribute(s). I thought that NX retained the instance attribute of G because G (on its own) has no instance. But since E has an instance, I thought that it would keep the instance attribute of E, and not B!

Can someone explain this behavior? Is there a possibility (without a callback) / option to "force" the instance attribute of the replaced component (in this example, from E?)

Thank you for your time!

Marc
NX Software Developer