I am creating a service using transaction SEGW. I have created my data model as an XML file and imported it by right clicking Data Model->Import->Data Model From File. After writing some code for one of my entity_set methods, I realized that there was an additional entity_set that I needed to create. I created the entity_set using the SEGW UI. I then Generated my runtime objects. To my surprise, the code that I had written for the other entity_set had been overwritten. Is there any way to Generate Runtime Objects for when additions to the data model are made without overwriting existing code?