SSDM-3284: fixing dtos with missing fields/logic

SVN: 35864

openbis_api/source/java/ch/ethz/sis/openbis/generic/asapi/v3/dto/common/update/FieldUpdateValue.java

@@ -45,6 +45,9 @@ public class FieldUpdateValue<T> implements Serializable
     @JsonIgnore
     public void setValue(T value)
     {
+        if (this.value == value) {
+            return;
+        }
         this.value = value;
         this.isModified = true;
     }