What are the Steps to Change a Contract Line using FBDI for Contract Under Amendment?

Summary

What are the Steps to Change a Contract Line using FBDI for Contract Under Amendment?

Content

Scenario:

Contract was created using FBDI and has status of Active

User, via screens, places contract Under Amendment

I have been told that I can update the contract (header, lines, everything). Upload attempts of the contract_line.csv file including statuses of 'DRAFT' and "ACTIVE". Both resulted in error "The line status isn't compatible with the status of the parent line or the contract. (OKC-196094)"

Unclear if this is user error or if simply not allowed for contract_line.csv.....other files with out a "Status Code" updated perfectly.