Brand, Category, Pattern Size unique

src/com/yourcompany/babydatenbank/model/Brand.java

@@ -15,7 +15,7 @@ public class Brand {
     @Column(length=36)
 	private String oid;
 	
-	@Column(length=20)
+	@Column(length=20, unique=true)
 	private String description;
 	
 	@OneToMany(mappedBy="brand")

src/com/yourcompany/babydatenbank/model/Category.java

@@ -14,7 +14,7 @@ public class Category {
     @Column(length=36)
 	private String oid;
 	
-	@Column(length=20)
+	@Column(length=20, unique=true)
 	private String description;
 	
 	@OneToMany(mappedBy="category")

src/com/yourcompany/babydatenbank/model/Pattern.java

@@ -15,7 +15,7 @@ public class Pattern {
     @Column(length=36)
 	private String oid;
 	
-	@Column(length=20)
+	@Column(length=20, unique=true)
 	private String description;
 	
 	@OneToMany(mappedBy="pattern")

src/com/yourcompany/babydatenbank/model/Size.java

@@ -14,7 +14,7 @@ public class Size {
     @Column(length=36)
 	private String oid;
 	
-	@Column(length=20)
+	@Column(length=20, unique=true)
 	private String description;
 
 	public String getDescription() {