Cannot Switch Attribute Set After Upgrade to Magento 2.1.0

[webspeaks]

Preconditions

1. I have upgraded from 2.0.7 to 2.1.0. Now in admin when I try to switch the attributes sets of product, the JavaScript loader appears and never goes away. In console I see JavaScript error.

Steps to reproduce

1. Upgrade to 2.1.0 from 2.0.7
2. Add new product attribute set
3. Create new product, and change the attribute set from dropdown

Expected result

1. New attribute set should load

Actual result

1. One thing I notice is when I change attribute set, product name, SKU and price textboxes become empty.
2. Also I get JavaScript error. See below screenshot:
   
   

[adamstacey]

Is there any update on this?

[webspeaks]

Strange enough, this bug occurred in one of mu installation. But upgrade on other installation went well.
Cant say what is that.

[TClilMouse]

Same issue here. But here is my console error message
TypeError: $data.recordData(...) is undefined
knockout.js%20line%202624%20%3E%20Function:1:69

[victor-v-rad]

Tried to update M2.0.7 to M2.1.0 and can't reproduce. Have you figured out the cause of the issue?
If you use Chrome try hard reload of cache. It might help

[TClilMouse]

Destination attribute set had a group or attribute where the origin attribute set doesn't have. I was able to fix my issue by adding the "Bundle Items" group in my destination attribute set.

[webspeaks]

Got it, this occurs when you have and attribute in different Attribute sets.
For example you created and attribute named 'ATTR'. You created two attributes sets 'SET1' and 'SET2'.
Now in SET1, the ATTR is in Price group but in SET2 ATTR is in 'Product Details' group.. Now when you switch from SET1 to SET2, you will see the above error.

So always make sure that all attributes reside in same groups across all attribute sets,

[maderlock]

OK, so here is an updated way to reproduce this issue:

1. Install Magento 2.1.2 (seems like this has not been fixed from 2.1.0)
2. Create a new attribute set.
3. Move some attributes into the new attribute set
4. Create a new product and try to select the new attribute set

Expected result:
The set of attributes shown will change

Actual result:
Attributes are cleared and shown as failed validation.
JS error shown: VM8003:3 Uncaught TypeError: Cannot read property 'length' of undefined(…)
Spinner does not clear

Upshot: It is not possible to create a product in anything other than the default attribute set

[maderlock]

As a work-around, I edited eav_entity_type and cleared the config cache. Now creating as product defaults to my new attribute set.

[itaymesh]

@maderlock what have you changed on the eav_entity_type table?

[ctadlock]

To further clarify the issue and workaround #6173 (comment)...

In order to switch a product from one attribute set to another, the destination attribute set must contain the attributes of the source attribute set in the same attribute group. Since all product start out as the Default attribute set, all subsequent attribute sets must have similar group structure to this otherwise you wont be able to switch.