Looking for some guidance relating to amending bundled MDQ products. 

The Problem: On amendment quotes, the quantity of bundled MDQ products is locked when I want it to be editable. This isn't the case when the MDQ product is added as a standalone line. I'm not sure if this is standard (undocumented) behaviour or if it is related to my configuration.

Context

The bundle structure is the following:

• Wrapper bundle
  • MDQ Subscription Product 1
  • MDQ Subscription Product 2

Both products have:

• MDQ dimensions
  • Type = Custom
  • Quantity Editable = True
• Product fields
  • Quantity Editable = True
  • Default Amendment Behavior = Allow Refund
• Product Option fields:
  • Quantity Editable = True
  • Type = Related Product

When I attempt to amend a contract, I can edit the quantity of the wrapper bundle, but not the quantity of the child MDQ products.

Is this standard MDQ behaviour? If I can't amend quantities this way, I will need to completely rethink the bundle structure. Any help would be much appreciated!