Cross Company Buyng
Cross Company Buying is a functionality in MyCart that allows a user to switch between different Companys (company codes) they are authorized for in SAP, in order to access company-code-specific catalogs, views, and settings..
When the user selects another company via the Cross Company Buying control, the system re-triggers the Login Logic.
This reloads the user context so that only data relevant to the selected company code (e.g., catalogs, views, configuration) is shown.
Background
In standard behavior, users are assigned a default organization, which determines the initial company code and purchasing context at login.
For users with access to multiple company codes (e.g., different countries or legal entities), it is not intended to display all catalogs and configurations simultaneously. Cross Company Buying ensures that only the relevant data for the selected organization is active at any given time.
Prerequisite
Users must have multiple organizations maintained in their user profile or you create a new Organization in your Profil.
Each organization represents a distinct company setup and must be fully configured in advance.

Switch from Company
Click on your user avatar in the top-right corner
Select Cross Company Buying

Choose the organization (company) you want to buy for
Confirm your selection

Once you switch to another organization, your company code is automatically updated and the corresponding plant, purchasing organization, and purchasing group are applied. As a result, you will only see catalogs and data that are relevant to the selected organization, ensuring that everything displayed matches the company you are currently working for.