Hello,
working throught the tutorial of ABAP RESTful Programming i experienced an issue with a definition of a behaviour
I think it is missing this line to work properly
field ( numbering : managed ) mykey;
If you finish this tutorial it is only possible to create exactly one new instance. Adding more than one results in an error. The reason for this is that in the database table
ZTRAVEL_XXX
The key is 0000000... for the created entry. Maybe @mervey45 can update this section?