3793789 - FPE1: error >0123 “account is only intended for tax postings”

• In transaction FPE1, posting a payment on account fails with error >0123: “Account &1 &2 is only intended for tax postings”.
• Customizing: function “Post Payments on Account as Down Payments” (TFK001B-XAKAN) is set as active. 
• The error starts after a patch; manual postings were possible before.
  
  
  

  "Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 

• SAP S/4HANA 
• SAP ERP 
• Contract Accounts Receivable and Payable 

fpe1, >0123, account only intended for tax postings, payments on account, down payment, tfk001b xakan, posting area 0020, tax clearing account, ftxp, tax category, fi-ca, contract accounting, s/4hana, utilities, >0219 , KBA , IS-U-CA , Contract Accounts Receivable and Payable , IS-PS-CA , Public Sector Contract Accounting , IS-T-CA , Contract Accounting , FI-CAX , Non-industry specific contract accounts receivable, payable , FI-CA , Contract Accounts Receivable and Payable , Problem