diff --git a/src/main/resources/db/changelog/migrations/43-Change_PcrBatchItem_to_use_StorageUnitUsage.xml b/src/main/resources/db/changelog/migrations/43-Change_PcrBatchItem_to_use_StorageUnitUsage.xml
index 10809773..e4d4e12b 100644
--- a/src/main/resources/db/changelog/migrations/43-Change_PcrBatchItem_to_use_StorageUnitUsage.xml
+++ b/src/main/resources/db/changelog/migrations/43-Change_PcrBatchItem_to_use_StorageUnitUsage.xml
@@ -5,11 +5,21 @@
         xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog https://local.xsd/dbchangelog-4.4.xsd"
         objectQuotingStrategy="QUOTE_ONLY_RESERVED_WORDS">
 
-    <changeSet id="43-Change_PcrBatchItem_to_use_StorageUnitUsage" context="schema-change" author="cgendreau">
+    <changeSet id="43-Change_PcrBatchItem_to_use_StorageUnitUsage-1" context="schema-change" author="cgendreau">
+        <preConditions onFail="CONTINUE">
+            <sqlCheck expectedResult="0">
+                SELECT COUNT(*)
+                FROM pcr_batch_item
+                WHERE well_row is NOT NULL
+            </sqlCheck>
+        </preConditions>
+        <comment>Make sure all pcr_batch_item.well_row are null.</comment>
         <dropColumn tableName="pcr_batch_item">
             <column name="well_column"/>
             <column name="well_row"/>
         </dropColumn>
+    </changeSet>
+    <changeSet id="43-Change_PcrBatchItem_to_use_StorageUnitUsage-2" context="schema-change" author="cgendreau">
         <addColumn tableName="pcr_batch_item">
             <column name="storage_unit_usage" type="uuid"/>
         </addColumn>
diff --git a/src/main/resources/db/changelog/migrations/44-Change_SeqReaction_to_use_StorageUnitUsage.xml b/src/main/resources/db/changelog/migrations/44-Change_SeqReaction_to_use_StorageUnitUsage.xml
index 9f5d8f8a..3da7d859 100644
--- a/src/main/resources/db/changelog/migrations/44-Change_SeqReaction_to_use_StorageUnitUsage.xml
+++ b/src/main/resources/db/changelog/migrations/44-Change_SeqReaction_to_use_StorageUnitUsage.xml
@@ -5,11 +5,21 @@
         xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog https://local.xsd/dbchangelog-4.4.xsd"
         objectQuotingStrategy="QUOTE_ONLY_RESERVED_WORDS">
 
-    <changeSet id="44-Change_SeqReaction_to_use_StorageUnitUsage" context="schema-change" author="cgendreau">
+    <changeSet id="44-Change_SeqReaction_to_use_StorageUnitUsage-1" context="schema-change" author="cgendreau">
+        <preConditions onFail="CONTINUE">
+            <sqlCheck expectedResult="0">
+                SELECT COUNT(*)
+                FROM seq_reaction
+                WHERE well_row is NOT NULL
+            </sqlCheck>
+        </preConditions>
+        <comment>Make sure all seq_reaction.well_row are null.</comment>
         <dropColumn tableName="seq_reaction">
             <column name="well_column"/>
             <column name="well_row"/>
         </dropColumn>
+    </changeSet>
+    <changeSet id="44-Change_SeqReaction_to_use_StorageUnitUsage-2" context="schema-change" author="cgendreau">
         <addColumn tableName="seq_reaction">
             <column name="storage_unit_usage" type="uuid"/>
         </addColumn>