diff --git a/imap_processing/tests/test_decom.py b/imap_processing/tests/test_decom.py
index 5e8f36f9c..f5edf1bde 100644
--- a/imap_processing/tests/test_decom.py
+++ b/imap_processing/tests/test_decom.py
@@ -31,18 +31,16 @@ def test_ccsds_header(xtce_document):
         ("SRC_SEQ_CTR", "UINT14"),
         ("PKT_LEN", "UINT16"),
     ]
-    header_container_set = (
-        '<xtce:SequenceContainer name="CCSDSPacket">'
-        "        <xtce:EntryList>"
-        '                <xtce:ParameterRefEntry parameterRef="VERSION" />'
-        '                <xtce:ParameterRefEntry parameterRef="TYPE" />'
-        '                <xtce:ParameterRefEntry parameterRef="SEC_HDR_FLG" />'
-        '                <xtce:ParameterRefEntry parameterRef="PKT_APID" />'
-        '                <xtce:ParameterRefEntry parameterRef="SEQ_FLGS" />'
-        '                <xtce:ParameterRefEntry parameterRef="SRC_SEQ_CTR" />'
-        '                <xtce:ParameterRefEntry parameterRef="PKT_LEN" />'
-        "        </xtce:EntryList>"
-        "</xtce:SequenceContainer>"
+    header_entry_list = (
+        "<xtce:EntryList>"
+        '        <xtce:ParameterRefEntry parameterRef="VERSION" />'
+        '        <xtce:ParameterRefEntry parameterRef="TYPE" />'
+        '        <xtce:ParameterRefEntry parameterRef="SEC_HDR_FLG" />'
+        '        <xtce:ParameterRefEntry parameterRef="PKT_APID" />'
+        '        <xtce:ParameterRefEntry parameterRef="SEQ_FLGS" />'
+        '        <xtce:ParameterRefEntry parameterRef="SRC_SEQ_CTR" />'
+        '        <xtce:ParameterRefEntry parameterRef="PKT_LEN" />'
+        "</xtce:EntryList>"
     )
 
     # Read in the XTCE document
@@ -59,8 +57,8 @@ def test_ccsds_header(xtce_document):
 
     # Check that the header is defined as a SequenceContainer in the XTCE file
     # First remove discrepancies in whitespace, tabs, and newlines
-    header_container_set = (
-        header_container_set.replace(" ", "").replace("\t", "").replace("\n", "")
+    header_entry_list = (
+        header_entry_list.replace(" ", "").replace("\t", "").replace("\n", "")
     )
     document = document.replace(" ", "").replace("\t", "").replace("\n", "")
-    assert header_container_set in document
+    assert header_entry_list in document
diff --git a/imap_processing/ultra/packet_definitions/P_U45_AUXILIARY.xml b/imap_processing/ultra/packet_definitions/P_U45_AUXILIARY.xml
index 21847cad1..ba9df7149 100644
--- a/imap_processing/ultra/packet_definitions/P_U45_AUXILIARY.xml
+++ b/imap_processing/ultra/packet_definitions/P_U45_AUXILIARY.xml
@@ -359,7 +359,7 @@
 		<!-- End metadata -->
 		<xtce:ContainerSet>
 			<!--CCSDS Header Elements-->
-			<xtce:SequenceContainer name="CCSDSPacket">
+			<xtce:SequenceContainer name="CCSDSPacket" abstract="true">
 				<xtce:EntryList>
 					<xtce:ParameterRefEntry parameterRef="VERSION" />
 					<xtce:ParameterRefEntry parameterRef="TYPE" />
diff --git a/imap_processing/ultra/packet_definitions/P_U45_IMAGE_RATES.xml b/imap_processing/ultra/packet_definitions/P_U45_IMAGE_RATES.xml
index af42114ef..22301f2d4 100644
--- a/imap_processing/ultra/packet_definitions/P_U45_IMAGE_RATES.xml
+++ b/imap_processing/ultra/packet_definitions/P_U45_IMAGE_RATES.xml
@@ -193,7 +193,7 @@
 		</xtce:ParameterSet>
 		<!-- End metadata -->
 		<xtce:ContainerSet>
-			<xtce:SequenceContainer name="CCSDSPacket">
+			<xtce:SequenceContainer name="CCSDSPacket" abstract="true">
 				<xtce:EntryList>
 					<xtce:ParameterRefEntry parameterRef="VERSION" />
 					<xtce:ParameterRefEntry parameterRef="TYPE" />