Cannot differentiate between a BPA Change Order for Direct (Inventory) and a BPA Change Order for In

Summary

Use of line item attributes like Item and Category Name aren't working

Content

I have a client that has different $ levels of approval required for a BPA for Inventory versus non-Inventory. This works fine for a new BPA, I can use the Item attribute at the BPA line level to differentiate. The don't mix BPAs (Inventory & non-Inventory lines). However, when I do a Change Order on the BPA, neither the Item (is blank / is not blank) nor the Category Name (equals "Inventory" / does not equal "Inventory") work. I get an error in workflow each time. I've opened an SR on this, but haven't gotten an answer as to whether