According to the North Dakota Office of State Tax Commissioner Guideline - Income Tax: Military Service members you do not have to attach any orders to your tax return to claim the deduction of your federal active duty compensation.

What page and paragraph does it say that a copy of orders are not required? I couldn't find that mentioned. 

The state tax form specifically requests it and so does the turbotax software when I entered the amount in. 

There is no requirement to attach a copy of your military orders to a ND state tax return. 

Neither the 2020 North Dakota Individual Income Tax instructions,  Form ND-1 2020 or Military Service Members Income Tax Guideline list any requirement to attach a copy of your military orders to the state tax return.

If you are a resident of ND, your active-duty military income is taxable.

   -   From Military Service Members Income Tax Guideline  If you are a service member who is domiciled in North Dakota all year and are required to file a federal income tax return, you are required to file a North Dakota income tax return. You are subject to North Dakota income tax on all of your income regardless of its source. This applies regardless of where you are stationed during the year.

If you are stationed in ND, but not a ND resident, your military income is exempt from ND tax under the Soldier and Sailor;s Civil Relief Act.

If you are a military retiree and resident of ND, your retired military pay is exempt from ND tax.