Encounter loader occasstionally fails with code -2^-1

[shabiel]

bash-3.2$ mumps -r ^%XCMD 'ZWRITE ^%wd(17.040801,3,49,"load","encounters",10,*)'
^%wd(17.040801,3,49,"load","encounters",10,"log",1)="ID is: 21b8fe35-3a31-42ec-8533-a224276b3745"
^%wd(17.040801,3,49,"load","encounters",10,"log",2)="code is: 185349003"
^%wd(17.040801,3,49,"load","encounters",10,"log",3)="code system is: http://snomed.info/sct"
^%wd(17.040801,3,49,"load","encounters",10,"log",4)="reasonCode is: "
^%wd(17.040801,3,49,"load","encounters",10,"log",5)="reasonCode system is: "
^%wd(17.040801,3,49,"load","encounters",10,"log",6)="effectiveDateTime is: 1924-04-01T00:41:40-05:00"
^%wd(17.040801,3,49,"load","encounters",10,"log",7)="fileman dateTime is: 2240401.00414"
^%wd(17.040801,3,49,"load","encounters",10,"log",8)="hl7 dateTime is: 19240401004140-0500"
^%wd(17.040801,3,49,"load","encounters",10,"log",9)="endDateTime is: 1924-04-01T00:56:40-05:00"
^%wd(17.040801,3,49,"load","encounters",10,"log",10)="fileman endDateTime is: 2240401.00564"
^%wd(17.040801,3,49,"load","encounters",10,"log",11)="hl7 endDateTime is: 19240401005640-0500"
^%wd(17.040801,3,49,"load","encounters",10,"log",12)="HL7 StartDateTime is: 19240401004140-0500"
^%wd(17.040801,3,49,"load","encounters",10,"log",13)="HL7 End DateTime is: 19240401005640-0500"
^%wd(17.040801,3,49,"load","encounters",10,"log",14)="Provider for outpatient is: 9990000348"
^%wd(17.040801,3,49,"load","encounters",10,"log",15)="Location for outpatient is: GENERAL MEDICINE"
^%wd(17.040801,3,49,"load","encounters",10,"log",16)="Calling ENCTUPD^SYNDHP61 data loader to add encounter"
^%wd(17.040801,3,49,"load","encounters",10,"log",17)="Return from data loader was: -2^-1"
^%wd(17.040801,3,49,"load","encounters",10,"parms","CLINIC")="GENERAL MEDICINE"
^%wd(17.040801,3,49,"load","encounters",10,"parms","DHPPAT")="1801988844V507048"
^%wd(17.040801,3,49,"load","encounters",10,"parms","ENCPROV")=9990000348
^%wd(17.040801,3,49,"load","encounters",10,"parms","ENDDT")="19240401005640-0500"
^%wd(17.040801,3,49,"load","encounters",10,"parms","SCTCPT")=185349003
^%wd(17.040801,3,49,"load","encounters",10,"parms","SCTDX")=""
^%wd(17.040801,3,49,"load","encounters",10,"parms","STARTDT")="19240401004140-0500"
^%wd(17.040801,3,49,"load","encounters",10,"status","loadMessage")="-2^-1"
^%wd(17.040801,3,49,"load","encounters",10,"status","loadstatus")="notLoaded"
^%wd(17.040801,3,49,"load","encounters",10,"status","return")="-2^-1"
^%wd(17.040801,3,49,"load","encounters",10,"status","return","APPT")=1
^%wd(17.040801,3,49,"load","encounters",10,"status","return","CKIN")=1
^%wd(17.040801,3,49,"load","encounters",10,"status","return","CKOUT")="-1^No Outpatient Encounter record^No Visit record"
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","ENCOUNTER",1,"ENC D/T")=2240401.0041
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","ENCOUNTER",1,"ENCOUNTER TYPE")="P"
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","ENCOUNTER",1,"HOS LOC")=49
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","ENCOUNTER",1,"PATIENT")=40
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","ENCOUNTER",1,"SERVICE CATEGORY")="A"
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","PROCEDURE",1,"PROCEDURE")="3543O"
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","PROCEDURE",1,"QTY")=1
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","PROVIDER",1,"NAME")=146
^%wd(17.040801,3,49,"load","encounters",10,"status","return","ENCDATA","PROVIDER",1,"PRIMARY")=1
^%wd(17.040801,3,49,"load","encounters",10,"vars","code")=185349003
^%wd(17.040801,3,49,"load","encounters",10,"vars","codeSystem")="http://snomed.info/sct"
^%wd(17.040801,3,49,"load","encounters",10,"vars","effectiveDateTime")="1924-04-01T00:41:40-05:00"
^%wd(17.040801,3,49,"load","encounters",10,"vars","endDateTime")="1924-04-01T00:56:40-05:00"
^%wd(17.040801,3,49,"load","encounters",10,"vars","fmDateTime")=2240401.00414
^%wd(17.040801,3,49,"load","encounters",10,"vars","fmEndDateTime")=2240401.00564
^%wd(17.040801,3,49,"load","encounters",10,"vars","hl7DateTime")="19240401004140-0500"
^%wd(17.040801,3,49,"load","encounters",10,"vars","hl7endDateTime")="19240401005640-0500"
^%wd(17.040801,3,49,"load","encounters",10,"vars","id")="21b8fe35-3a31-42ec-8533-a224276b3745"
^%wd(17.040801,3,49,"load","encounters",10,"vars","reasonCode")=""
^%wd(17.040801,3,49,"load","encounters",10,"vars","reasonCodeSys")=""
^%wd(17.040801,3,49,"load","encounters",10,"vars","resourceType")="Encounter"