If it happens with one and not with the other may be a network problem not sure about it.
How can you import the changes from USR layer to VAR by using Tools options?
For exporting the objects from USR to VAR
you need to export the objects from USR layer and open the application with VAR (which you do by selecting the layer in client configuration) and import the objects into VAR layer. Now the objects will be both layers USR and VAR. now open the USR layer and delete all the objects then objects will be deleted from top most layer that is USR layer.
its my first time to convert user layer changes into var .
i have already exported user layer changes with a project .
as you suggested select the VAR layer from client configuration, but when i go into client configuration its showing disable the “Application object layer to open.” option.
I think you are trying to open the application in another layer.
The above message will come when you are trying to open the application in lower layers like var,bus etc - with out entering Developer License code in the configuration utility. you need to enter the developer license code which you will get along with license file.
Yes need to have license codes for opening the application in VAR layer. if you are not entering the Correct code then it will be opened in USR layer only.
You will have a separate group like Development codes.
Any way its better you contact your administrator or person who deals with that or some one can send a mail to ms support requesting the latest license codes.