QPR-12275 const correctness, add method to set single additional field

Author: pcaspers

OREData/ored/portfolio/envelope.cpp

@@ -130,5 +130,10 @@ boost::any Envelope::additionalAnyField(const std::string& name, const bool mand
     return it == additionalFields_.end() ? defaultValue : it->second;
 }
 
+void Envelope::setAdditionalField(const std::string& key, const boost::any& value) {
+    additionalFields_[key] = value;
+}
+
+
 } // namespace data
 } // namespace ore

OREData/ored/portfolio/envelope.hpp

@@ -99,14 +99,15 @@ class Envelope : public XMLSerializable {
     //@{
     const string& counterparty() const { return counterparty_; }
     const string& nettingSetId() const { return nettingSetDetails_.nettingSetId(); }
-    const NettingSetDetails nettingSetDetails() { return nettingSetDetails_; }
+    const NettingSetDetails nettingSetDetails() const { return nettingSetDetails_; }
     const set<string>& portfolioIds() const { return portfolioIds_; }
     const map<string, string> additionalFields() const;
     const map<string, boost::any>& fullAdditionalFields() const { return additionalFields_; }
     string additionalField(const std::string& name, const bool mandatory = true,
                            const std::string& defaultValue = std::string()) const;
     boost::any additionalAnyField(const std::string& name, const bool mandatory = true,
                                   const boost::any& defaultValue = boost::none) const;
+    void setAdditionalField(const std::string& key, const boost::any& value);
     //@}
 
     //! \name Utility