I had previously been successful at transforming a package in my model where the destination was another package in my model (2019 MBPLE). This ensured I did not overwrite my 150% model with the transformed model. The basic structure is shown below. The transformed model destination was in "04.03 Instance Models", however now with 2021 the transformation no longer lets me choose a designation. Any ideas how to correct for this?

01 Conceptual Model
02 Feature Model
03 Physical Model (150% model)
04 Configurations
04.01 Instances
04.02 Instance Diagrams
04.03 Instance Models