model changes for product inventory 637

src/main/java/org/etsi/osl/tmf/am651/model/Agreement.java

...in/java/org/etsi/osl/tmf/am651/model/AgreementCreate.java

...in/java/org/etsi/osl/tmf/am651/model/AgreementUpdate.java

...ain/java/org/etsi/osl/tmf/am651/model/Characteristic.java

...java/org/etsi/osl/tmf/pim637/model/BillingAccountRef.java

src/main/java/org/etsi/osl/tmf/pim637/model/EntityRef.java

src/main/java/org/etsi/osl/tmf/pim637/model/Error.java

...java/org/etsi/osl/tmf/pim637/model/EventSubscription.java

...org/etsi/osl/tmf/pim637/model/EventSubscriptionInput.java

src/main/java/org/etsi/osl/tmf/pim637/model/Money.java

src/main/java/org/etsi/osl/tmf/pim637/model/Place.java

src/main/java/org/etsi/osl/tmf/pim637/model/Price.java

...n/java/org/etsi/osl/tmf/pim637/model/PriceAlteration.java

src/main/java/org/etsi/osl/tmf/pim637/model/Product.java

...sl/tmf/pim637/model/ProductAttributeValueChangeEvent.java

...pim637/model/ProductAttributeValueChangeEventPayload.java

...java/org/etsi/osl/tmf/pim637/model/ProductBatchEvent.java

...g/etsi/osl/tmf/pim637/model/ProductBatchEventPayload.java

...ain/java/org/etsi/osl/tmf/pim637/model/ProductCreate.java

...ava/org/etsi/osl/tmf/pim637/model/ProductCreateEvent.java