Unable to save Feasibility study to model tree

I am using Creo Parametric Release 12.4 and Datecode12.4.3.0 I am building a parametric model derived from an anatomical scan of the lower leg to generate a custom orthosis, with the goal of regenerating the model when the input scan changes. To define a specific point on a curve within this model, I am using a feasibility study in the BMX (Behavioral Modeling) module. The study runs successfully and returns a feasible solution, but the checkbox to save the study as a feature in the model tree remains grayed out and cannot be selected. I have successfully saved a similar feasibility study as a model tree feature in the same model previously, using the same approach, so I do not believe this is a configuration issue. The behavior appears to be specific to this study. Software version: Creo Parametric [12.4.3.0] OS: Windows 11 Could you advise on what conditions must be met for the "save to model tree" option to become active, and why it might be grayed out despite a successful feasibility result? Here are the errors that I faced 16:18 Optimizing... 16:18 Completing step 3 of optimization. 16:18 A feasible solution has been successfully found.