diff --git a/.tool-versions b/.tool-versions
index fe7dce623..2e4f5fad6 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
 oscal-cli 2.5.0
-oscal-server v1.0.0-SNAPSHOT-6363f60-20241202160440
\ No newline at end of file
+oscal-server v1.0.0-c4af4df-20250408112708
\ No newline at end of file
diff --git a/src/validations/constraints/fedramp-external-constraints.xml b/src/validations/constraints/fedramp-external-constraints.xml
index 05fbfdfe7..33d096ba5 100644
--- a/src/validations/constraints/fedramp-external-constraints.xml
+++ b/src/validations/constraints/fedramp-external-constraints.xml
@@ -94,7 +94,7 @@
         <metapath target="/system-security-plan"/>
         <constraints>
             <let var="import-profile-href" expression="import-profile/@href"/>
-            <let var="resolved-import-profile-href" expression="if (starts-with($import-profile-href, '#')) then back-matter/resource[@uuid = substring($import-profile-href, 2)]/rlink/@href else $import-profile-href"/>
+            <let var="resolved-import-profile-href" expression="if (starts-with($import-profile-href, '#')) then resolve-reference(Q{http://csrc.nist.gov/ns/oscal/1.0}back-matter/resource[@uuid = substring($import-profile-href, 2)]/rlink/@href) else $import-profile-href"/>
             <let var="sensitivity-level-floor" expression=
                 "if (system-characteristics/security-sensitivity-level = 'fips-199-high')
                     then ('fips-199-high')