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A QSO with KG4W is being erroneously identified in my log in Rumlog as being Guantanamo (DXCC 105) while in fact it is VA. I thought it would be an easy fix just by reassigning KG4 to W in EditDXCC. However It would seem that only KG4's with a two-letter suffix are from Guantanamo but not those with one or three. Something similarly odd happens with KC4, which is a normal preffix for callsigns in the US and only when used as /KC4 it means "W in Antartica". Is there a way to correct for these FCC peculiarities causing erroneous DXCC's assignments?

TU es 73 de Jose VA3PCJ.

Deleting the prefixes KG4 and KC4 is a good starting point. Take care where do you delete it! Do not delete it under the "DXCC" tab! KG4 is the short here only for the DXCC Guantanamo. This does not mean, a KG4 call is assigned to Guantanamo. You can delete it under the "Prefix" tab. In the current distributed database it is already not included any longer. When you have worked a real KG4 Guantanamo station, you have to enter this under the "Calls" tab.
After editing the database, you have to reload it into RUMlog. Use the provided button in the "EditDXCC" application, or restart RUMlog. After that you have to recalculate the wrong logged QSO. Select all affected QSOs and select Menu-->QSO-->Recalculate DXCC-->With zones

Got it! Much appreciated.
TU es 73. Jose VA3PCJ