I see some stations are listed incorrectly in the WDQMS system.
Based on the header, name and coordinates, these are stations in Myanmar (Burma):
WMOID WSI (NOT OFFICIAL) Station Name LAT LONG ELEV
48993 0-104-1-ANN ANN 19.767 94 15
48991 0-104-1-TAUNGUP TAUNGKOK (TAUNGUP) 18.85 94.233 4
48992 0-104-1-ZAUNGDU ZAUNGTU (ZAUNGDU) 17.5 96.217 31
Based on the WDQMS, these are stations in Cambodia.
It is as if the former Cambodian 5-digit WMO identifiers are being reused by Myanmar.