Multiple places in the 2016 Base QRDA-1 HL7 IG (i.e. "HL7 CDA® R2 Implementation Guide: Quality Reporting Document Architecture Category I (QRDA I); Release 1, DSTU Release 3 - US Realm, Draft Standard for Trial Use, Volume 2 - Templates and Supporting Material, June 2015") define the Medication Supply Request template ID @extension to be "2015-04-05".

For example, "Table 358: Template List", "Table 359: Template Containments", "Table 184: Medication Order (V2) Constraints Overview", "Table 219: Medication Supply Request (V2) Constraints Overview", Section "11.51 Medication Order (V2)", Section "11.52 Medication Supply Request (V2)", and Section "4.42.3 Medication Supply Request (V2)" all say that the @extension should be "2015-04-05".

Unfortunately, CONF:1140-13821/1140-28374 says the @extension should be "2014-12-09", like this...

4. SHALL contain exactly one [1..1] templateId (CONF:1140-13821) such that it
a. SHALL contain exactly one [1..1] @root="2.16.840.1.113883.10.20.24.3.99" (CONF:1140-13822).
b. SHALL contain exactly one [1..1] @extension="2014-12-09" (CONF:1140-28374).

And, to complicate things further, the example in "Figure 101: Medication Supply Request (V2)", says the @extension should be "2014-12-01", like this...

<supply classCode="SPLY" moodCode="RQO">
<!-- Medication Supply Request (V2) template -->
<templateId root="2.16.840.1.113883.10.20.24.3.99" extension="2014-12-01"/>

The Schematron rules provided by ESAC implement the CONF:1140-13821 exactly as it is written but this is almost certainly wrong. If it is correct then multiple sections of the 2016 Base QRDA-1 HL7 IG need to be updated to agree with that definition.