diff --git a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/OrderLineDTO.java b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/OrderLineDTO.java
index 65a64bf2a..4e0994b6c 100644
--- a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/OrderLineDTO.java
+++ b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/OrderLineDTO.java
@@ -15,6 +15,8 @@
 import java.math.BigDecimal;
 import java.util.Objects;
 
+import static io.swagger.annotations.ApiModelProperty.AccessMode.READ_ONLY;
+
 @ApiModel( description = "A billed unit" )
 public class OrderLineDTO implements Line
 {
@@ -45,11 +47,11 @@ public class OrderLineDTO implements Line
     @ApiModelProperty( "If this is a one-off cost" )
     private boolean setup;
 
-    @ApiModelProperty( value = "Discount percentage if this line is relative to a coupon", example = "20", readOnly = true )
+    @ApiModelProperty( value = "Discount percentage if this line is relative to a coupon", example = "20", accessMode = READ_ONLY )
     private BigDecimal discount;
 
-    @ApiModelProperty( value = "Requested billing item maximum quantity", example = "15", readOnly = true )
-    private Integer maximum;
+    @ApiModelProperty( value = "Requested billing item maximum quantity", example = "15.00", accessMode = READ_ONLY )
+    private BigDecimal maximum;
 
     @ApiModelProperty( "Custom billing identifier" )
     private String identifier;
@@ -79,7 +81,7 @@ public BigDecimal getPriceExcludingVAT()
         return getSubtotal();
     }
 
-    @ApiModelProperty( readOnly = true )
+    @ApiModelProperty( accessMode = READ_ONLY )
     public BigDecimal getSubtotal()
     {
         if ( price == null || price.getPrice() == null ) return BigDecimal.ZERO;
@@ -89,7 +91,7 @@ public BigDecimal getSubtotal()
                 .setScale( MathConfiguration.DEFAULT_PRECISION, MathConfiguration.ROUNDING_MODE );
     }
 
-    @ApiModelProperty( value = "VAT total amount", readOnly = true )
+    @ApiModelProperty( value = "VAT total amount", accessMode = READ_ONLY )
     @JsonProperty( value = "vatSpunOff" )
     public BigDecimal getVATSpunOff()
     {
@@ -197,12 +199,12 @@ public void setDiscount( BigDecimal discount )
         this.discount = discount;
     }
 
-    public Integer getMaximum()
+    public BigDecimal getMaximum()
     {
         return maximum;
     }
 
-    public void setMaximum( Integer maximum )
+    public void setMaximum( BigDecimal maximum )
     {
         this.maximum = maximum;
     }
diff --git a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionBillingItemDTO.java b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionBillingItemDTO.java
index 0f74cf56d..cb9faf1f8 100644
--- a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionBillingItemDTO.java
+++ b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionBillingItemDTO.java
@@ -2,14 +2,18 @@
 
 import io.swagger.annotations.ApiModelProperty;
 
+import java.math.BigDecimal;
 import java.util.Objects;
 
+import static com.liberologico.cloudesire.common.MathConfiguration.DAY_SCALE_PRECISION;
+import static com.liberologico.cloudesire.common.MathConfiguration.ROUNDING_MODE;
+
 public class SubscriptionBillingItemDTO extends DTO
 {
     private UrlEntityDTO billingItem;
 
-    @ApiModelProperty( "The chosen value for this billing item" )
-    private Integer value;
+    @ApiModelProperty( "The current value for this billing item" )
+    private BigDecimal value;
 
     @ApiModelProperty( "Whether the billing item has been already bought for the Subscription" )
     private Boolean bought;
@@ -25,7 +29,7 @@ public class SubscriptionBillingItemDTO extends DTO
     public SubscriptionBillingItemDTO( UrlEntityDTO billingItem, Integer value, boolean bought )
     {
         this.billingItem = billingItem;
-        this.value = value;
+        this.value = new BigDecimal( value ).setScale( DAY_SCALE_PRECISION, ROUNDING_MODE );
         this.bought = bought;
     }
 
@@ -48,12 +52,12 @@ public void setBillingItem( UrlEntityDTO billingItem )
         this.billingItem = billingItem;
     }
 
-    public Integer getValue()
+    public BigDecimal getValue()
     {
         return value;
     }
 
-    public void setValue( Integer value )
+    public void setValue( BigDecimal value )
     {
         this.value = value;
     }
diff --git a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionV1DTO.java b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionV1DTO.java
index 1734ef1ac..0ea03b016 100644
--- a/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionV1DTO.java
+++ b/cloudesire-api-client-dto/src/main/java/com/cloudesire/platform/apiclient/dto/model/dto/SubscriptionV1DTO.java
@@ -1,25 +1,26 @@
 package com.cloudesire.platform.apiclient.dto.model.dto;
 
+import java.math.BigDecimal;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
 
 public class SubscriptionV1DTO extends BaseSubscriptionDTO
 {
-    private Map<UrlEntityDTO, Integer> billingItems = new HashMap<>();
+    private Map<UrlEntityDTO, BigDecimal> billingItems = new HashMap<>();
 
-    public Map<UrlEntityDTO, Integer> getBillingItems()
+    public Map<UrlEntityDTO, BigDecimal> getBillingItems()
     {
         return billingItems;
     }
 
-    public SubscriptionV1DTO setBillingItems( Map<String, Integer> billingItems )
+    public SubscriptionV1DTO setBillingItems( Map<String, BigDecimal> billingItems )
     {
         if ( billingItems == null ) return this;
 
         this.billingItems = new HashMap<>();
 
-        for ( Map.Entry<String, Integer> entry : billingItems.entrySet() )
+        for ( Map.Entry<String, BigDecimal> entry : billingItems.entrySet() )
         {
             this.billingItems.put( new UrlEntityDTO( entry.getKey() ), entry.getValue() );
         }
diff --git a/common-dto/src/main/java/com/liberologico/cloudesire/common/MathUtils.java b/common-dto/src/main/java/com/liberologico/cloudesire/common/MathUtils.java
index e80ff9e38..3446c314a 100644
--- a/common-dto/src/main/java/com/liberologico/cloudesire/common/MathUtils.java
+++ b/common-dto/src/main/java/com/liberologico/cloudesire/common/MathUtils.java
@@ -15,6 +15,16 @@ public static BigDecimal addPercentage( BigDecimal base, BigDecimal pct )
         return base.add( percentage( base, pct, MathConfiguration.COMPUTATION_PRECISION ) );
     }
 
+    public static boolean isBetween( BigDecimal number, int min, int max )
+    {
+        return isBetween( number, new BigDecimal( min ), new BigDecimal( max ) );
+    }
+
+    public static boolean isBetween( BigDecimal number, BigDecimal min, BigDecimal max )
+    {
+        return min.compareTo( number ) <= 0 && number.compareTo( max ) <= 0;
+    }
+
     public static BigDecimal subtractPercentage( BigDecimal base, BigDecimal pct )
     {
         if ( base == null ) return BigDecimal.ZERO;
@@ -114,6 +124,11 @@ public static BigDecimal bytesToGigabytes( BigDecimal bytes )
         return bytes.divide( rescale, computationMathContext() );
     }
 
+    public static boolean equalsByComparing( BigDecimal a, long b )
+    {
+        return equalsByComparing( a, new BigDecimal( b ) );
+    }
+
     public static boolean equalsByComparing( BigDecimal a, BigDecimal b )
     {
         if ( a == null ) return b == null;