The issue is as follows:

I'm unable to enter any PTE tax on MD K WKS Section D line 2 no matter what I put on the individual shareholders MD K-1 Section D line 2.  The PS error check takes me  to the Sch K wks when I  run the error check.  Whatever cause, this issue is what appears to be preventing me from efiling this return. (please see attached).

In addition,  

The Federal Form 1120S has a loss of $40,002 on line 21 - Schedule K-1's for each respective shareholder line 1 has their % share of the loss - 40,002 * 51% = 20,401,, 40002 * 49% = 19,001.  

The loss flows through to the MD K Wks Section A line 1 as $40,000 which is $2/less than the federal income. The income amount on the Sch K Wks Section A line 1 can not be changed unless overridden.

Estimated payments were entered on the MD Information wks Part III in the amount paid.  The estimated tax Section D line 2 of the MD Sch K wks does not allow me to enter the total estimated tax.  However, for each respective shareholder I can enter their % of the total tax in Section D line 2 but it does not show up on the MD SCH D. 

When I do an error check the system points to line 2 of Section D, which doesn't allow entry of the amount.  Attempting to manually enter the amount it doesn't appear and the line space becomes pink?

I've studied the PTE tax and have had other clients with the tax and had no issue.  Entering the tax as MD state withholding on the federal Schedule K-1 has not been a problem except with this particular return PS now states that the MD return can't be efiled but mailed due to separate MD WH. 

What the heck!  I'm tearing my hair out at this point.  If it weren't for the other returns I've filed successfully I likely just print and mail but now I think there is some issue somewhere in the return that is causing the error/malfunction.