unable to add a new date range for a new tree version in a control budget

Summary:

unable to add a new date range for a new tree version in a control budget

Content (please ensure you mask any confidential information):

Has anyone ever encountered this issue? I created a control budget with a reference to another control budget as source. I included an hierarchy for one of the segments and added a specific version for each year. Now I want to add a new year and an new version of the hierarchy, but the add button is greyed out.

I can update the existing ranges but I can't add new.

I have double checked the tree hierarchy and versions already a couple of times but I can't see any issues with them, there active, audited and flattened, I refreshed the tree for budgetary controle as well.