I you don't want the PCB Interface to backannotate the PKG_TYPE values back to DxDesigner modify the configuration file in the BeginAttPassList section. Look for PKG PKG_TYPE and add the keyword DontBackAnno. So in the configuration file it will look something like this
BeginAttPassList
Specific
|BeginOatAtts
COM REFDES
COM $OBJNAME
COM PADS_ID
COM SYMTAG
COM PKG_LOCK
NET PADS_ID
PIN #
NET $OBJNAME
|EndOatAtts
PIN PINTYPE
PKG DEVICE
PKG PKG_TYPE DontBackAnno