diff --git a/guide/release-notes/v3.0.18.adoc b/guide/release-notes/v3.0.18.adoc
index 1df439c5..ea20e9fa 100644
--- a/guide/release-notes/v3.0.18.adoc
+++ b/guide/release-notes/v3.0.18.adoc
@@ -16,6 +16,7 @@ Release date:: November 2024
 * The rule (PEPPOL-EN16931-R002), which ensures that the Invoice Note (BT-22) appears no more than once, will not apply if both the buyer and seller are German organizations.
 * Update for country-specific rule NL-R-008 Make rule domestic-only.
 * sample files and snippits have been updated to reflect the new rule PEPPOL-EN16931-R131
+* Severity of Swedish country specific rules SE-R-003, SE-R-004 and SE-R-013 which verifies format of Swedish organization numbers are changed from warning to fatal.
 
 [attributes]
 ====
diff --git a/rules/sch/PEPPOL-EN16931-CII.sch b/rules/sch/PEPPOL-EN16931-CII.sch
index ccf7624b..10a2b666 100644
--- a/rules/sch/PEPPOL-EN16931-CII.sch
+++ b/rules/sch/PEPPOL-EN16931-CII.sch
@@ -444,9 +444,9 @@ Last update: 2024 May release 3.0.17.
       <assert id="SE-R-002" test="string(number(substring(ram:SpecifiedTaxRegistration/ram:ID[@schemeID = 'VAT'], 3, 12))) != 'NaN'" flag="fatal">For Swedish suppliers, the Swedish VAT-numbers must have the trailing 12 characters in numeric form</assert>
     </rule>
     <rule context="rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:SpecifiedLegalOrganization[../ram:PostalTradeAddress/ram:CountryID = 'SE' and ram:ID]">
-      <assert id="SE-R-003" test="string(number(ram:ID)) != 'NaN'" flag="warning">Swedish organisation numbers should be numeric.</assert>
-      <assert id="SE-R-004" test="string-length(normalize-space(ram:ID)) = 10" flag="warning">Swedish organisation numbers consist of 10 characters.</assert>
-	  <assert id="SE-R-013" test="u:checkSEOrgnr(normalize-space(ram:ID))" flag="warning">The last digit of a Swedish organization number must be valid according to the Luhn algorithm.</assert>	  
+      <assert id="SE-R-003" test="string(number(ram:ID)) != 'NaN'" flag="fatal">Swedish organisation numbers should be numeric.</assert>
+      <assert id="SE-R-004" test="string-length(normalize-space(ram:ID)) = 10" flag="fatal">Swedish organisation numbers consist of 10 characters.</assert>
+	  <assert id="SE-R-013" test="u:checkSEOrgnr(normalize-space(ram:ID))" flag="fatal">The last digit of a Swedish organization number must be valid according to the Luhn algorithm.</assert>	  
     </rule>
     <rule context="rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty[ram:PostalTradeAddress/ram:CountryID = 'SE' and ram:SpecifiedLegalOrganization/ram:ID]/ram:SpecifiedTaxRegistration/ram:ID[@schemeID = 'FC']">
       <assert id="SE-R-005" test="normalize-space(upper-case(.)) = 'GODKÄND FÖR F-SKATT'" flag="fatal">For Swedish suppliers, when using Seller tax registration identifier, 'Godkänd för F-skatt' must be stated</assert>
diff --git a/rules/sch/PEPPOL-EN16931-UBL.sch b/rules/sch/PEPPOL-EN16931-UBL.sch
index f469bcbc..d8609fff 100644
--- a/rules/sch/PEPPOL-EN16931-UBL.sch
+++ b/rules/sch/PEPPOL-EN16931-UBL.sch
@@ -698,11 +698,11 @@ Last update: 2024 November release 3.0.18.
     </rule>
     <rule
       context="//cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity[../cac:PostalAddress/cac:Country/cbc:IdentificationCode = 'SE' and cbc:CompanyID]">
-      <assert id="SE-R-003" test="string(number(cbc:CompanyID)) != 'NaN'" flag="warning">Swedish
+      <assert id="SE-R-003" test="string(number(cbc:CompanyID)) != 'NaN'" flag="fatal">Swedish
         organisation numbers should be numeric.</assert>
-      <assert id="SE-R-004" test="string-length(normalize-space(cbc:CompanyID)) = 10" flag="warning">Swedish
+      <assert id="SE-R-004" test="string-length(normalize-space(cbc:CompanyID)) = 10" flag="fatal">Swedish
         organisation numbers consist of 10 characters.</assert>
-      <assert id="SE-R-013" test="u:checkSEOrgnr(normalize-space(cbc:CompanyID))" flag="warning">The
+      <assert id="SE-R-013" test="u:checkSEOrgnr(normalize-space(cbc:CompanyID))" flag="fatal">The
         last digit of a Swedish organization number must be valid according to the Luhn algorithm.</assert>
     </rule>
     <rule
diff --git a/rules/unit-CII-SE/CII-IN_SE-R-003.xml b/rules/unit-CII-SE/CII-IN_SE-R-003.xml
index b0c5e080..c95cf942 100644
--- a/rules/unit-CII-SE/CII-IN_SE-R-003.xml
+++ b/rules/unit-CII-SE/CII-IN_SE-R-003.xml
@@ -251,7 +251,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-003</warning>
+			<error>SE-R-003</error>
 		</assert>
 <rsm:CrossIndustryInvoice
  xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
diff --git a/rules/unit-CII-SE/CII-IN_SE-R-004.xml b/rules/unit-CII-SE/CII-IN_SE-R-004.xml
index d5117bd9..9dd415e2 100644
--- a/rules/unit-CII-SE/CII-IN_SE-R-004.xml
+++ b/rules/unit-CII-SE/CII-IN_SE-R-004.xml
@@ -251,7 +251,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-004</warning>
+			<error>SE-R-004</error>
 		</assert>
 <rsm:CrossIndustryInvoice
  xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
diff --git a/rules/unit-CII-SE/CII-IN_SE-R-013.xml b/rules/unit-CII-SE/CII-IN_SE-R-013.xml
index ec76bdec..b96d5245 100644
--- a/rules/unit-CII-SE/CII-IN_SE-R-013.xml
+++ b/rules/unit-CII-SE/CII-IN_SE-R-013.xml
@@ -251,7 +251,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-004</warning>
+			<error>SE-R-013</error>
 		</assert>
 <rsm:CrossIndustryInvoice
  xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
diff --git a/rules/unit-UBL-SE/UBL-CN_SE-R-003.xml b/rules/unit-UBL-SE/UBL-CN_SE-R-003.xml
index 20b37ad6..fa524f4f 100644
--- a/rules/unit-UBL-SE/UBL-CN_SE-R-003.xml
+++ b/rules/unit-UBL-SE/UBL-CN_SE-R-003.xml
@@ -170,7 +170,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-003</warning>
+			<error>SE-R-003</error>
 		</assert>
 <CreditNote 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" 
diff --git a/rules/unit-UBL-SE/UBL-CN_SE-R-004.xml b/rules/unit-UBL-SE/UBL-CN_SE-R-004.xml
index 02b2d8a3..c554040d 100644
--- a/rules/unit-UBL-SE/UBL-CN_SE-R-004.xml
+++ b/rules/unit-UBL-SE/UBL-CN_SE-R-004.xml
@@ -170,7 +170,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-004</warning>
+			<error>SE-R-004</error>
 		</assert>
 <CreditNote 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" 
diff --git a/rules/unit-UBL-SE/UBL-IN_SE-R-003.xml b/rules/unit-UBL-SE/UBL-IN_SE-R-003.xml
index 4fceb60b..bb93b980 100644
--- a/rules/unit-UBL-SE/UBL-IN_SE-R-003.xml
+++ b/rules/unit-UBL-SE/UBL-IN_SE-R-003.xml
@@ -162,7 +162,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-003</warning>
+			<error>SE-R-003</error>
 		</assert>
 <Invoice 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" 
diff --git a/rules/unit-UBL-SE/UBL-IN_SE-R-004.xml b/rules/unit-UBL-SE/UBL-IN_SE-R-004.xml
index 2017fdd4..f079a1b8 100644
--- a/rules/unit-UBL-SE/UBL-IN_SE-R-004.xml
+++ b/rules/unit-UBL-SE/UBL-IN_SE-R-004.xml
@@ -162,7 +162,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-004</warning>
+			<error>SE-R-004</error>
 		</assert>
 <Invoice 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" 
diff --git a/rules/unit-UBL-SE/UBL-IN_SE-R-013.xml b/rules/unit-UBL-SE/UBL-IN_SE-R-013.xml
index d9d6e23b..490f6bb0 100644
--- a/rules/unit-UBL-SE/UBL-IN_SE-R-013.xml
+++ b/rules/unit-UBL-SE/UBL-IN_SE-R-013.xml
@@ -162,7 +162,7 @@
 	</test>
 	<test>
 		<assert>
-			<warning>SE-R-013</warning>
+			<error>SE-R-013</error>
 		</assert>
 <Invoice 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"