A sample XML snippet is given below in 'additional specification 2.2.2.8.16'.
Based on the mapping table, I will assume that the correct XML snippet should be as following, with the 'code' element describing that this observation is for medication type data , and 'value' element describing the actual type of medication.
<entryRelationship typeCode='SUBJ'>
<observation classCode='OBS' moodCode='EVN'>
<templateId root='2.16.840.1.113883.3.88.11.83.8.1' />
<code code='xxxx' displayName='Medication Type'
codeSystem='xxxx' codeSystemName='xxxx' />
<value xsi:type='CE' code='73639000' displayName='Prescription Drug'
codeSystem='2.16.840.1.113883.6.96' codeSystemName='SNOMED CT'/>
</observation>
<entryRelationship>
I think the sample medication XML needs to be updated.