Index: trunk/grails-app/i18n/messages.properties
===================================================================
--- trunk/grails-app/i18n/messages.properties	(revision 592)
+++ trunk/grails-app/i18n/messages.properties	(revision 599)
@@ -175,4 +175,5 @@
 inventoryMovement.still.associated=Could not complete operation as inventory movements are still associated with this item.
 
+inventoryItemPurchase.purchaseOrderNumber.not.unique.for.inventory.item.order=Purchase Order Number must be unique for this inventory item order.
 inventoryItemPurchase.invoiceNumber.required=An invoice number must be supplied to approve payment.
 inventoryItemPurchase.delete.failure.received.exists=Could not delete, items have been received.