diff --git a/src/main/kotlin/com/restapi/domain/models.kt b/src/main/kotlin/com/restapi/domain/models.kt
index ae44333..b9338a5 100644
--- a/src/main/kotlin/com/restapi/domain/models.kt
+++ b/src/main/kotlin/com/restapi/domain/models.kt
@@ -306,7 +306,7 @@ open class PurchaseOrder : BaseTenantModel() {
 }
 
 enum class UOM {
-    NOS, LTR, MTR, ALL
+    KG, CFT, TON, LTR, NUMBER, MTR, BOX, CUM, PACKET, ALL, NOS;
 }
 
 enum class TypeOfProduct {
@@ -330,6 +330,8 @@ open class Product : BaseTenantModel() {
     @Enumerated(EnumType.STRING)
     var uom: UOM? = null
 
+    var gstPct: Double? = 0.0
+
     @Enumerated(EnumType.STRING)
     var type: TypeOfProduct? = null
 
diff --git a/src/main/resources/dbmigration/1.26.sql b/src/main/resources/dbmigration/1.26.sql
new file mode 100644
index 0000000..7f0734c
--- /dev/null
+++ b/src/main/resources/dbmigration/1.26.sql
@@ -0,0 +1,7 @@
+-- drop dependencies
+alter table product drop constraint if exists ck_product_uom;
+-- apply alter tables
+alter table product alter column uom type varchar(6);
+alter table product add column if not exists gst_pct float;
+-- apply post alter
+alter table product add constraint ck_product_uom check ( uom in ('KG','CFT','TON','LTR','NUMBER','MTR','BOX','CUM','PACKET','ALL','NOS'));
diff --git a/src/main/resources/dbmigration/model/1.26.model.xml b/src/main/resources/dbmigration/model/1.26.model.xml
new file mode 100644
index 0000000..cbd3e70
--- /dev/null
+++ b/src/main/resources/dbmigration/model/1.26.model.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<migration xmlns="http://ebean-orm.github.io/xml/ns/dbmigration">
+    <changeSet type="apply">
+        <alterColumn columnName="uom" tableName="product" type="varchar(6)" currentType="varchar(3)" currentNotnull="false" checkConstraint="check ( uom in ('KG','CFT','TON','LTR','NUMBER','MTR','BOX','CUM','PACKET','ALL','NOS'))" checkConstraintName="ck_product_uom"/>
+        <addColumn tableName="product">
+            <column name="gst_pct" type="double"/>
+        </addColumn>
+    </changeSet>
+</migration>
\ No newline at end of file