Missouri State Income Tax Calculation and Marital Status

I have a client that has employee's in MO and they are wondering how other clients calculate MO State Income Tax.  MO requires that employee's indicate whether the Spouse is working or is not working, but there is no marital status for this scenario in E1 in the Martial Status UDC table for MO. Do you use one for another State and it just is correct in the second description of the UDC?

So out of curiosity what are other clients doing to be compliant?  Setting up M or S gets the taxes close, but still not correct.

Thank you,