What causes this when posting Bill. (API) Something you're trying to use has been made inactive. Check the fields with accounts, customers, items, vendors or employees..

Hello there, @sgh.

We can open the transaction which you're about to edit but, then you receive the error message. From there, we can easily identify the field or item that is needed to be reactivated.

Here's how:

1. Go to the Customers, Vendors, Employees, Chart of Accounts, and Product and Services page.
2. Click the Gear icon.
3. Tap Include inactive.
4. Find the item you wanted to reactivate.
5. Under ACTION, hit Make active.

For additional information about the process, consider checking out this article: Add, edit, or inactivate an employee. 

Please keep in touch if you need anything else. I'll make sure to help.