Problem with organization determination in a transaction.

I am working on IDES CRM system and I am trying to add an organization unit under predefined organizational unit "IDES CRM Training Company".

I want this org unit to be automatically determined during sales transactions. I am able to check the Sales operation in "Allow Org. Unit to be Determined" section of new org unit. After save, if I come back to that org unit again, its getting unchecked. Is it not saving properly?

I tried many times but the result is same. But for positions inside this org unit, I dont have such problem(the checkbox remains checked)

While defining Org determination rule, during simulation, I am able to get the position but not the org unit.

Even when I add a business partner to a transaction, I am getting error saying "Enter an organizational unit (Sales)" and the details suggest me to define Org determination rules.

But I already defined a rule and created a profile and attached it to transaction.

Is it the case that its not saving the Org unit properly and everything is the result of it? If yes, how can I get rid of it?

Please help.