Please find my answers below:
- The possible values for "Status" column in UI are sufficient, limiting spend of the campaigns sharing it, or not used by any campaign. You can see these details if you hover over the question mark on the "Status" header in the UI. This field is not available via API at the moment.
- UI does not have a column corresponding to BudgetCampaignAssociationStatus. But you can find the number of campaigns currently associated with that shared budget in the UI.
- Thanks for pointing this out. I will inform the team to get the documentation corrected. API is currently returning "Current" or "Enabled" for the BudgetCampaignAssociationStatus field.
In the new UI, you can find the Budgets report by clicking the 3 vertical dots on top right corner and select Shared budgets under SHARED LIBRARY section.
Thanks,
Sreelakshmi, AdWords API Team