Hi everyone
We have three Dynamics environments - DEV (Unmanaged), UAT (Managed) and LIVE (Managed). I have made some changes to an Opportunity entity form in a solution in DEV and they work fine. However, when importing the solution to UAT the changes don't appear in the form. I've had a look and I assume the problem is the Unmanaged layer showing in UAT for the Opportunity entity:

I am not a Dynamics expert so I'm slightly confused about the above. I'm assuming that the fact that the unmanaged layer is showing as active means it is blocking any changes made in any of the managed solutions, even though the solution I'm changing (highlighted in yellow) is at the top of the list (I assumed they were applied in that order)?
I did try removing the unmanaged layer but when I try that I get the following error:

I'm now not sure what I can do to make any changes to this entity if I can't remove the unmanaged layer? Is there another way of removing it? I'd be really grateful for any help anyone could provide.
Thanks in advance.