I am not at all encouraging you to modify SAP standard programs or objects. But there are situations where you need to do this for example implementing form user exits in SD, creating objects as per sap notes etc. Whenever you modify an SAP standard objects or create object in SAP namespace system prompt you to enter access key. This is how you can generate this access key from service.sap.com.
You will get this dialog box if you try to modify SAP standard object. This gives you key of the object you are going to create or change along with SAP Release and Installation number. You need this information to generate key. In case you do not have authorisation to generate access key you need to pass these information to the person you are requesting.
Log on to service.sap.com with your credentials and click on link Keys & Requests.
Once you are in Keys and Requests click on ‘SSCR Keys’.
Now select Register Object.
Easiest way is to copy values from dialog box using Cntrl + Y method and paste it here in PgmID Type Object name and press Check button.
You will then have object validated with system name in bottom. Match your installation number and select it using square tick-box in first column and press Register.
You should have message Object successfully registered with Registration Key xxxx
Copy this number (access key) and paste it in dialog box which you had in SAP system.
And press Continue. System will now let you modify the object.
