diff --git a/src/core/entity.cpp b/src/core/entity.cpp
index 08614df..f203599 100644
--- a/src/core/entity.cpp
+++ b/src/core/entity.cpp
@@ -22,4 +22,12 @@ void Entity::setUuidFromString(const std::string& uuidString)
 inline Entity::State Entity::getState() const
 {
     return state_;
+}
+
+void Entity::setSourceNo(int sourceNo) {
+    sourceNo_ = sourceNo;
+}
+
+int Entity::getSourceNo() const {
+    return sourceNo_;
 }
\ No newline at end of file
diff --git a/src/core/entity.h b/src/core/entity.h
index 11890c6..7c37fbf 100644
--- a/src/core/entity.h
+++ b/src/core/entity.h
@@ -12,15 +12,20 @@ class Entity
     enum class State { NEW, UPDATE, DELETE, OK };
 
     virtual ~Entity() = 0;
-    const boost::uuids::uuid& getUuid() const { return uuid_; };
+
     void createUuid();
     void setUuidFromString(const std::string& uuidString);
-    virtual State getState() const;
     void setState(State state) { state_ = state; }
+    void setSourceNo(int sourceNo);
+
+    const boost::uuids::uuid& getUuid() const { return uuid_; };
+    virtual State getState() const;
+    virtual int getSourceNo() const;
 
   private:
     boost::uuids::uuid uuid_{};
     State state_{State::NEW};
+    int sourceNo_{};
 };
 
 #endif // ENTITY_H
\ No newline at end of file