Big problem saving sales orders

[Guido1982]

I discovered this just now: I can't modify sales orders. When I create one, the status will be "created". Then when I try and change the status, it will be "Approved", no matter which status I choose. And when I try to change let's say, the recurring invoice frequency, it will stay empty. Lastly, I tried mass-editing a couple of sales orders, which led to all SO's being the status "approved" and worse: ALL products and services were overwritten with the products and services of the last one.