Should i enter amount in schedule K-1 box 14A in the Missouri tax return K-1 additions section?

[IreneS]

No - It is not necessary to enter the amount in schedule K-1 box 14A in your Missouri tax return.

Box 14A simply indicates that the income listed is self-employment income.   It is already included in the Box 1 amount.

If you received a MO K-1 in addition to the federal K-1, then you would compare the two forms and enter any differences as additions or subtractions on the MO return.