domain: server
language: python
class Item class
Enables editing of data in the dataset.
After a call to edit, an application can enable users to change data in the
fields of the record, and can then post those changes to the item dataset using
post method, and then apply them to database using
apply method.
The edit method
checks if item dataset is active, otherwise raises exception
checks if item dataset is not empty, otherwise raises exception
checks whether the item dataset is already in edit state, and if so, returns
if item is a detail , checks if the master item is in edit or insert state , otherwise raises exception
if item is not a detail , checks if it is in browse state , otherwise raises exception
puts the item into edit state , enabling the application or user to modify fields in the record