There is now a publicly-available UDC (User Defined Contest Module) for N1MM+ that properly scores the Tisza Cup contest. The download link is
https://n1mmwp.hamdocs.com/mmfiles/categories/userdefinedcontests/ and look for Tisza_Cup.zip in the list.
Files to be used should be copied/extracted to the folder....Documents\N1MM Logger+\UserDefinedContests
TISZA_CUP.udc is for stations in 'TISZA' countries.(OM, HA, UR, YO & YU)
TISZA_CDX.udc is for stations NOT in the above 'TISZA' countries.
Don't forget to enter YOUR Sent Exchange info (CQ Zone) when setting up for the contest.
N1MM+ version over 8501 is required.
Contest was added in Version 8.07 Beta 4.
Dowload link: http://www.ucxlog.org/
Please check it by starting the contest and logging some test QSOs.
After check use menu “Contest – Delete …” to remove the test QSOs.