"STMT" means that there is a statement attached to the K-1 schedule that explains more about the entry. "STMT" isn't an acceptable code to enter on your tax return.  

Box 9 with a code of "A" means there is depreciation to be allocated to the recipient, and there can be various options as to how to report that, so that is probably why there is a statement attached.

The form 1041` schedule k1 I received Has *A typed under the #9 and in the amount for box 9 is "STMT".

Irs instruction for form1041 schedule K1  page 40 states that this is the correct way of entering the STMT code.

The following was copied and pasted directly from the IRS instructions:

To assist the beneficiary in figuring any applicable passive activity loss limitations, also attach a separate schedule showing the beneficiary's share of directly apportionable deductions derived from each trade or business, rental real estate, and other rental activity.

Enter the beneficiary's share of directly apportioned deductions using codes A through C. Depreciation (code A).

Enter the beneficiary's share of the depreciation deductions directly apportioned to each activity reported in boxes 5 through 8. 

See page 41: https://www.irs.gov/pub/irs-pdf/i1041.pdf

If you are entering your K-1 into TurboTax using Step-by-Step, you need to enter a dollar figure in that box.