in Cypress v4.0.3, i've seen some patients which has the following information

<doseQuantity value="1" unit="{dose(s)}"/> under a Medication, Active.

When i checked the reference document namely:

"HL7 CDA® R2 Implementation Guide:
Quality Reporting Document Architecture Category I
(QRDA I),
Release 1,
STU Release 5, US Realm
Volume 2 — Templates and Supporting Material
December 2017"

it is stated that 

This doseQuantity SHOULD contain zero or one [0..1] @unit, which SHALL be selected
from ValueSet UnitsOfMeasureCaseSensitive
urn:oid:2.16.840.1.113883.1.11.12839 DYNAMIC (CONF:1098-7526).

when i check the valueset above, it doesn't contain {dose(s)}.

So any explanation on why it is not in the valueset? or can i have the list of all possible possible units?