Problem with itemshop
 

I have a problem with the itemshop
i cannot change the order of the items!
the field is not changeable.
Is a bug?
if i create a new item i can put the number of order, but not the others created with the install.

I can't reproduce this. The acp doesn't differentiate between stock items and created items.

In the item manager for the respective category, select 'Edit Category'. Now select 'Yes' for the option, 'Arrange Item According by Number' or something similiar. This will allow you to input your own item arrangement.