diff --git a/test-cases/RMLTC0012b-MySQL/mapping.ttl b/test-cases/RMLTC0012b-MySQL/mapping.ttl
index 2f86c07..985da04 100644
--- a/test-cases/RMLTC0012b-MySQL/mapping.ttl
+++ b/test-cases/RMLTC0012b-MySQL/mapping.ttl
@@ -24,6 +24,7 @@
 <http://example.com/base/TriplesMap2> a rml:TriplesMap;
   rml:logicalSource [
       rml:source <http://example.com/base/#DB_source>;
+      rml:referenceFormulation rml:SQL2008Table;
       rml:iterator "lives"
     ];
   rml:predicateObjectMap [
diff --git a/test-cases/RMLTC0012b-PostgreSQL/mapping.ttl b/test-cases/RMLTC0012b-PostgreSQL/mapping.ttl
index d44ca6f..4b2bc1b 100644
--- a/test-cases/RMLTC0012b-PostgreSQL/mapping.ttl
+++ b/test-cases/RMLTC0012b-PostgreSQL/mapping.ttl
@@ -24,6 +24,7 @@
 <http://example.com/base/TriplesMap2> a rml:TriplesMap;
   rml:logicalSource [
       rml:source <http://example.com/base/#DB_source>;
+      rml:referenceFormulation rml:SQL2008Table;
       rml:iterator "lives"
     ];
   rml:predicateObjectMap [
diff --git a/test-cases/RMLTC0012b-SQLServer/mapping.ttl b/test-cases/RMLTC0012b-SQLServer/mapping.ttl
index 697ccba..dea61d5 100644
--- a/test-cases/RMLTC0012b-SQLServer/mapping.ttl
+++ b/test-cases/RMLTC0012b-SQLServer/mapping.ttl
@@ -24,6 +24,7 @@
 <http://example.com/base/TriplesMap2> a rml:TriplesMap;
   rml:logicalSource [
       rml:source <http://example.com/base/#DB_source>;
+      rml:referenceFormulation rml:SQL2008Table;
       rml:iterator "lives"
     ];
   rml:predicateObjectMap [