diff --git a/schema/suite_v2_0.xsd b/schema/suite_v2_0.xsd
index 51afeece..0753ee97 100644
--- a/schema/suite_v2_0.xsd
+++ b/schema/suite_v2_0.xsd
@@ -17,6 +17,12 @@
     </xs:restriction>
   </xs:simpleType>
 
+  <xs:simpleType name="fortran_id_type_unique">
+    <xs:restriction base="xs:ID">
+      <xs:pattern value="[A-Za-z][A-Za-z0-9_]{0,63}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
   <xs:simpleType name="subcycle_type">
     <xs:restriction base="xs:string">
       <xs:pattern value="[a-z][a-z0-9_]*"/>
@@ -32,8 +38,8 @@
 
   <xs:complexType name="scheme_type">
     <xs:simpleContent>
-      <xs:extension base="xs:string">
-        <xs:attribute name="version" type="xs:string" use="optional"/>
+      <xs:extension base="fortran_id_type">
+        <xs:attribute name="version" type="version_type" use="optional"/>
       </xs:extension>
     </xs:simpleContent>
   </xs:complexType>
@@ -41,8 +47,8 @@
   <xs:complexType name="nested_suite_group_type">
     <xs:simpleContent>
       <xs:extension base="xs:string">
-        <xs:attribute name="name" type="xs:string" use="required"/>
-        <xs:attribute name="group" type="xs:string" use="required"/>
+        <xs:attribute name="name" type="fortran_id_type" use="required"/>
+        <xs:attribute name="group" type="fortran_id_type" use="required"/>
         <xs:attribute name="file" type="xs:string" use="required"/>
       </xs:extension>
     </xs:simpleContent>
@@ -51,8 +57,8 @@
   <xs:complexType name="nested_suite_type">
     <xs:simpleContent>
       <xs:extension base="xs:string">
-        <xs:attribute name="name" type="xs:string" use="required"/>
-        <xs:attribute name="group" type="xs:string" use="optional"/>
+        <xs:attribute name="name" type="fortran_id_type" use="required"/>
+        <xs:attribute name="group" type="fortran_id_type" use="optional"/>
         <xs:attribute name="file" type="xs:string" use="required"/>
       </xs:extension>
     </xs:simpleContent>
@@ -94,7 +100,6 @@
         <xs:element name="scheme" type="scheme_type"/>
       </xs:choice>
       <xs:attribute name="loop" type="subcycle_type" use="optional"/>
-      <xs:attribute name="name" type="xs:string" use="optional"/>
     </xs:complexType>
   </xs:element>
 
@@ -122,7 +127,7 @@
         <xs:element name="scheme" type="scheme_type"/>
         <xs:element name="nested_suite" type="nested_suite_group_type"/>
       </xs:choice>
-      <xs:attribute name="name" type="xs:ID" use="required"/>
+      <xs:attribute name="name" type="fortran_id_type_unique" use="required"/>
     </xs:complexType>
   </xs:element>
 
@@ -142,8 +147,8 @@
           <xs:element name="finalize" type="scheme_type"/>
         </xs:choice>
       </xs:sequence>
-      <xs:attribute name="name"    type="xs:ID"        use="required"/>
-      <xs:attribute name="version" type="version_type" use="required"/>
+      <xs:attribute name="name"    type="fortran_id_type_unique" use="required"/>
+      <xs:attribute name="version" type="version_type"           use="required"/>
     </xs:complexType>
   </xs:element>
 
diff --git a/test/unit_tests/sample_suite_files/suite_invalid_group_fortran_id.xml b/test/unit_tests/sample_suite_files/suite_invalid_group_fortran_id.xml
new file mode 100644
index 00000000..0fbb40dc
--- /dev/null
+++ b/test/unit_tests/sample_suite_files/suite_invalid_group_fortran_id.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<suite name="ver_test_suite" version="2.0">
+  <group name="group-1">
+    <scheme>scheme1</scheme>
+    <scheme>scheme2</scheme>
+  </group>
+</suite>
diff --git a/test/unit_tests/sample_suite_files/suite_invalid_scheme_fortran_id.xml b/test/unit_tests/sample_suite_files/suite_invalid_scheme_fortran_id.xml
new file mode 100644
index 00000000..e236cbd0
--- /dev/null
+++ b/test/unit_tests/sample_suite_files/suite_invalid_scheme_fortran_id.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<suite name="ver_test_suite" version="2.0">
+  <group name="group1">
+    <scheme>scheme-1</scheme>
+    <scheme>scheme2</scheme>
+  </group>
+</suite>
diff --git a/test/unit_tests/sample_suite_files/suite_invalid_suite_fortran_id.xml b/test/unit_tests/sample_suite_files/suite_invalid_suite_fortran_id.xml
new file mode 100644
index 00000000..ae8a28a4
--- /dev/null
+++ b/test/unit_tests/sample_suite_files/suite_invalid_suite_fortran_id.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<suite name="ver-test-suite" version="2.0">
+  <group name="group1">
+    <scheme>scheme1</scheme>
+    <scheme>scheme2</scheme>
+  </group>
+</suite>
diff --git a/test/unit_tests/test_sdf.py b/test/unit_tests/test_sdf.py
index 5dd73d95..fbb2c1db 100644
--- a/test/unit_tests/test_sdf.py
+++ b/test/unit_tests/test_sdf.py
@@ -371,7 +371,7 @@ def test_bad_v2_suite_duplicate_group1(self):
             _ = validate_xml_file(compare, 'suite', schema_version, logger)
         # end with
         emsg = "Schemas validity error : Element 'group', attribute 'name': " + \
-            "'group1' is not a valid value of the atomic type 'xs:ID'"
+            "'group1' is not a valid value of the atomic type 'fortran_id_type_unique'"
         fmsg = str(context.exception)
         self.assertTrue(emsg in fmsg, msg=fmsg)
         if not emsg in fmsg:
@@ -534,3 +534,36 @@ def test_missing_schema_version(self):
         # Check exception for expected error messages
         self.assertTrue("version attribute required" in str(context.exception),
                         msg=f"Bad exception for missing suite version")
+
+    def test_invalid_fortran_id(self):
+        """Test that verification system recognizes a bad Fortran ID entry"""
+        num_tests = 3
+        header = "Test trapping of invalid Fortran ID"
+        tests = [
+            "suite_invalid_scheme_fortran_id",
+            "suite_invalid_group_fortran_id",
+            "suite_invalid_suite_fortran_id",
+        ]
+        exc_strings = [
+            "The value 'scheme-1' is not accepted by the pattern '[A-Za-z][A-Za-z0-9_]{0,63}",
+            "The value 'group-1' is not accepted by the pattern '[A-Za-z][A-Za-z0-9_]{0,63}",
+            "The value 'ver-test-suite' is not accepted by the pattern '[A-Za-z][A-Za-z0-9_]{0,63}",
+        ]
+        for test_num in range(num_tests):
+            # Setup
+            testname = tests[test_num]
+            source = os.path.join(_SAMPLE_FILES_DIR, f"{testname}.xml")
+            logger = self.get_logger()
+            _, xml_root = read_xml_file(source, logger)
+            schema_version = find_schema_version(xml_root)
+            self.assertEqual(schema_version[0], 2)
+            self.assertEqual(schema_version[1], 0)
+            # Exercise
+            with self.assertRaises(Exception) as context:
+                res = validate_xml_file(source, 'suite', schema_version, logger)
+            # end with
+            # Check exception for expected error messages
+            exp_str = str(context.exception)
+            self.assertTrue(exc_strings[test_num] in exp_str,
+                            msg=f"Bad exception in test {test_num + 1}, '{exp_str}'")
+        # end for