diff --git a/config/derivedchargers.go b/config/derivedchargers.go
new file mode 100644
index 000000000..5e624e1f4
--- /dev/null
+++ b/config/derivedchargers.go
@@ -0,0 +1,53 @@
+/*
+Rating system designed to be used in VoIP Carriers World
+Copyright (C) 2012-2014 ITsysCOM GmbH
+
+This program is free software: you can Storagetribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITH*out ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package config
+
+import (
+	"errors"
+	"github.com/cgrates/cgrates/utils"
+)
+
+type DerivedCharger struct {
+	RunId            string // Unique runId in the chain
+	ReqTypeField     string // Field containing request type info, number in case of csv source, '^' as prefix in case of static values
+	DirectionField   string // Field containing direction info
+	TenantField      string // Field containing tenant info
+	TorField         string // Field containing tor info
+	AccountField     string // Field containing account information
+	SubjectField     string // Field containing subject information
+	DestinationField string // Field containing destination information
+	SetupTimeField   string // Field containing setup time information
+	AnswerTimeField  string // Field containing answer time information
+	DurationField    string // Field containing duration information
+}
+
+type DerivedChargers []*DerivedCharger
+
+// Precheck that RunId is unique
+func (dcs DerivedChargers) Append(dc *DerivedCharger) (DerivedChargers, error) {
+	if dc.RunId == utils.DEFAULT_RUNID {
+		return nil, errors.New("Reserved RunId")
+	}
+	for _, dcLocal := range dcs {
+		if dcLocal.RunId == dc.RunId {
+			return nil, errors.New("Duplicated RunId")
+		}
+	}
+	return append(dcs, dc), nil
+}
diff --git a/config/derivedchargers_test.go b/config/derivedchargers_test.go
new file mode 100644
index 000000000..a23a5b9b7
--- /dev/null
+++ b/config/derivedchargers_test.go
@@ -0,0 +1,45 @@
+/*
+Rating system designed to be used in VoIP Carriers World
+Copyright (C) 2012-2014 ITsysCOM GmbH
+
+This program is free software: you can Storagetribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITH*out ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package config
+
+import (
+	"github.com/cgrates/cgrates/utils"
+	"testing"
+)
+
+func TestAppendDerivedChargers(t *testing.T) {
+	var err error
+	dcs := make(DerivedChargers, 0)
+	if _, err := dcs.Append(&DerivedCharger{RunId: utils.DEFAULT_RUNID}); err == nil {
+		t.Error("Failed to detect using of the default runid")
+	}
+	if dcs, err = dcs.Append(&DerivedCharger{RunId: "FIRST_RUNID"}); err != nil {
+		t.Error("Failed to add runid")
+	} else if len(dcs) != 1 {
+		t.Error("Unexpected number of items inside DerivedChargers configuration", len(dcs))
+	}
+	if dcs, err = dcs.Append(&DerivedCharger{RunId: "SECOND_RUNID"}); err != nil {
+		t.Error("Failed to add runid")
+	} else if len(dcs) != 2 {
+		t.Error("Unexpected number of items inside DerivedChargers configuration", len(dcs))
+	}
+	if _, err := dcs.Append(&DerivedCharger{RunId: "SECOND_RUNID"}); err == nil {
+		t.Error("Failed to detect duplicate runid")
+	}
+}