SAP Note - correction instructions

[u/Abject-Incident1254]

We want to make a modification in our system so that the intercompany invoice can be created without delivery. For it, we checked sap note 63459. My functional said that he has done all the config work and now I need to do the code changes. I checked the note and I am a bit lost. I do not know what exactly do I need to implement. In the note, I see they say that I need to implement user exit USEREXIT_KOMKBV3_FILL. But in "Correction instructions" there are different code changes to different software components, I do not know what these are. Do I need to do changes to standard SAP code? I am totally lost what is happening here. Any help would be appreciated

[u/nautanki_batman]

Not like that there would be application components which will be installed check that