External vendor fields: CI_ include or separate append?

[#1]

Hi all,

short question onbest practices:

How do you handle it when an external vendor needs additional fields in SAP standard structures/tables?

• Option 1:
  Add the fields to the existing CI_ include next to the customer fields. In our case, it's table KLAH, so we would add the field to CI_KLAH.
• Option 2:
  Create a separate vendor append (in several places if necessary). In our case, it would be something like /<vendor name space>/AKLAH.

How do you handle this in terms of maintenance, upgrades, and vendor ownership? Is there a published best practice by SAP?

Thanks!