In my production environment, i tried to create a new field using adobe campaign(extend the data in the table using an extension schema) but at the end return an error message. After that, i came XML edit screen page but all the old XML are invisible.
Please, what should I do for getting all my old XML code?
I am New to Adobe campaign. Please help me and also please explain what purpose we use to edit tab. If i delete my old XML code it affects database structure.
It is a best practice to test such modifications in a staging environment before attempting anything direclty in production.
When you extend an existing table with new fields, it is not supposed to change the original schema but to add a new schema with the same name with a different namespace (for example an extension to nms:recipient would be stored in a cus:recipient or kcm:recipient as in your screenshot).
But if you modify a schema I think there is no way to revert what you've done as it updates the database structure.