CDS Managed Association

Hi. I have a problem with managed associations .

https://help.sap.com/viewer/65de2977205c403bbc107264b8eccf4b/Cloud/en-US/22333827e3804097b5f0a4a4ac70ba27.html

If I create Books from Authors binding in UI, the Authors ID goes automaticly to Books ID, not to the new created column author_ID, is this an cds issue or my issue? Any help?