PRSDXREF ;HISC/GWB-SET AND KILL CROSS REFERENCES ;6/13/92  09:15
 ;;4.0;PAID;;Sep 21, 1995
KILL ;Kill existing cross reference
 D CHECK G:EXIT EXIT S XSAV=X
 F XREF=0:0 S XREF=$O(^DD(450,FLDNUM,1,XREF)) Q:XREF'>0  S X=XSAV X:$D(^DD(450,FLDNUM,1,XREF,2))#2 ^(2)
 G EXIT
SET ;Set new cross reference
 D CHECK G:EXIT EXIT S XSAV=X
 F XREF=0:0 S XREF=$O(^DD(450,FLDNUM,1,XREF)) Q:XREF'>0  S X=XSAV X:$D(^DD(450,FLDNUM,1,XREF,1))#2 ^(1)
EXIT K EXIT,XREF,XSAV
 Q
CHECK S EXIT=$S('$D(X):1,'$D(FLDNUM):1,X="":1,FLDNUM'>0:1,1:0)
 Q