adding model jpa elements

...main/java/org/etsi/osl/tmf/am651/model/AgreementItem.java

...java/org/etsi/osl/tmf/am651/model/ProductOfferingRef.java

...ava/org/etsi/osl/tmf/pcm620/model/ProductOfferingRef.java

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

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

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

...rg/etsi/osl/tmf/pim637/model/ProductOfferingPriceRef.java

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

...main/java/org/etsi/osl/tmf/pim637/model/ProductPrice.java

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

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

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

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

...rg/etsi/osl/tmf/pim637/model/RelatedProductOrderItem.java

...n/java/org/etsi/osl/tmf/po622/model/AgreementItemRef.java

src/main/java/org/etsi/osl/tmf/po622/model/AgreementRef.java

src/main/java/org/etsi/osl/tmf/po622/model/Any.java