diff --git a/config/attributescfg_test.go b/config/attributescfg_test.go
index a41ab4c1a..9bc858808 100644
--- a/config/attributescfg_test.go
+++ b/config/attributescfg_test.go
@@ -28,6 +28,9 @@ func TestAttributeSCfgloadFromJsonCfg(t *testing.T) {
 	jsonCfg := &AttributeSJsonCfg{
 		Enabled:               utils.BoolPointer(true),
 		Indexed_selects:       utils.BoolPointer(false),
+		Resources_conns:       &[]string{"*internal", "*conn1"},
+		Stats_conns:           &[]string{"*internal", "*conn1"},
+		Apiers_conns:          &[]string{"*internal", "*conn1"},
 		String_indexed_fields: &[]string{"*req.index1"},
 		Prefix_indexed_fields: &[]string{"*req.index1", "*req.index2"},
 		Suffix_indexed_fields: &[]string{"*req.index1"},
@@ -36,9 +39,9 @@ func TestAttributeSCfgloadFromJsonCfg(t *testing.T) {
 	}
 	expected := &AttributeSCfg{
 		Enabled:             true,
-		ApierSConns:         []string{},
-		StatSConns:          []string{},
-		ResourceSConns:      []string{},
+		ApierSConns:         []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaApier), "*conn1"},
+		StatSConns:          []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaStats), "*conn1"},
+		ResourceSConns:      []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaResources), "*conn1"},
 		IndexedSelects:      false,
 		StringIndexedFields: &[]string{"*req.index1"},
 		PrefixIndexedFields: &[]string{"*req.index1", "*req.index2"},
diff --git a/config/loaderscfg.go b/config/loaderscfg.go
index 3df06dd46..d37f59a20 100644
--- a/config/loaderscfg.go
+++ b/config/loaderscfg.go
@@ -157,7 +157,9 @@ func (self *LoaderSCfg) loadFromJsonCfg(jsnCfg *LoaderJsonCfg, msgTemplates map[
 		data := make([]*LoaderDataType, len(*jsnCfg.Data))
 		for idx, jsnLoCfg := range *jsnCfg.Data {
 			data[idx] = NewDfltLoaderDataTypeConfig()
-			data[idx].loadFromJsonCfg(jsnLoCfg, msgTemplates, separator)
+			if err := data[idx].loadFromJsonCfg(jsnLoCfg, msgTemplates, separator); err != nil {
+				return err
+			}
 		}
 		self.Data = data
 	}
diff --git a/config/loaderscfg_test.go b/config/loaderscfg_test.go
index a3027b7fe..e5875e00c 100644
--- a/config/loaderscfg_test.go
+++ b/config/loaderscfg_test.go
@@ -25,7 +25,7 @@ import (
 	"github.com/cgrates/cgrates/utils"
 )
 
-func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
+func TestLoaderSCfgloadFromJsonCfgCase1(t *testing.T) {
 	cfgJSONStr := `{
 			"loaders": [
 	{
@@ -33,7 +33,7 @@ func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
 		"enabled": true,
 		"tenant": "cgrates.org",
 		"lock_filename": ".cgr.lck",
-		"caches_conns": ["*internal"],
+		"caches_conns": ["*internal","*conn1"],
 		"field_separator": ",",
 		"tp_in_dir": "/var/spool/cgrates/loader/in",
 		"tp_out_dir": "/var/spool/cgrates/loader/out",
@@ -41,6 +41,7 @@ func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
 			{
 				"type": "*attributes",
 				"file_name": "Attributes.csv",
+                "flags": [],
 				"fields": [
 					{"tag": "TenantID", "path": "Tenant", "type": "*composed", "value": "~req.0", "mandatory": true,"layout": "2006-01-02T15:04:05Z07:00"},
 					],
@@ -63,7 +64,7 @@ func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
 			Id:             utils.MetaDefault,
 			Tenant:         ten,
 			LockFileName:   ".cgr.lck",
-			CacheSConns:    []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaCaches)},
+			CacheSConns:    []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaCaches), "*conn1"},
 			FieldSeparator: ",",
 			TpInDir:        "/var/spool/cgrates/loader/in",
 			TpOutDir:       "/var/spool/cgrates/loader/out",
@@ -71,6 +72,7 @@ func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
 				{
 					Type:     "*attributes",
 					Filename: "Attributes.csv",
+					Flags:    utils.FlagsWithParams{},
 					Fields: []*FCTemplate{
 						{
 							Tag:       "TenantID",
@@ -99,17 +101,158 @@ func TestLoaderSCfgloadFromJsonCfg(t *testing.T) {
 	}
 }
 
-func TestLoaderCfgAsMapInterface(t *testing.T) {
+func TestLoaderSCfgloadFromJsonCfgCase2(t *testing.T) {
+	cfgJSON := &LoaderJsonCfg{
+		Tenant: utils.StringPointer("a{*"),
+	}
+	expected := "invalid converter terminator in rule: <a{*>"
+	if jsonCfg, err := NewDefaultCGRConfig(); err != nil {
+		t.Error(err)
+	} else if err = jsonCfg.loaderCfg[0].loadFromJsonCfg(nil, jsonCfg.templates, jsonCfg.generalCfg.RSRSep); err != nil {
+		t.Error(err)
+	} else if err = jsonCfg.loaderCfg[0].loadFromJsonCfg(cfgJSON, jsonCfg.templates, jsonCfg.generalCfg.RSRSep); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestLoaderSCfgloadFromJsonCfgCase3(t *testing.T) {
+	cfgJson := &LoaderJsonCfg{
+		Data: &[]*LoaderJsonDataType{
+			{
+				Fields: &[]*FcTemplateJsonCfg{
+					{
+						Value: utils.StringPointer("a{*"),
+					},
+				},
+			},
+		},
+	}
+	expected := "invalid converter terminator in rule: <a{*>"
+	if jsonCfg, err := NewDefaultCGRConfig(); err != nil {
+		t.Error(err)
+	} else if err := jsonCfg.loaderCfg[0].loadFromJsonCfg(cfgJson, jsonCfg.templates, jsonCfg.generalCfg.RSRSep); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestLoaderSCfgloadFromJsonCfgCase4(t *testing.T) {
+	cfgJson := &LoaderJsonCfg{
+		Data: &[]*LoaderJsonDataType{
+			{
+				Fields: &[]*FcTemplateJsonCfg{
+					{
+						Type: utils.StringPointer(utils.MetaTemplate),
+					},
+				},
+			},
+		},
+	}
+	expected := "no template with id: <>"
+	if jsonCfg, err := NewDefaultCGRConfig(); err != nil {
+		t.Error(err)
+	} else if err = jsonCfg.loaderCfg[0].loadFromJsonCfg(cfgJson, jsonCfg.templates, jsonCfg.generalCfg.RSRSep); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestLoaderSCfgloadFromJsonCfgCase5(t *testing.T) {
+	cfgJson := &LoaderJsonCfg{
+		Data: &[]*LoaderJsonDataType{
+			{
+				Fields: &[]*FcTemplateJsonCfg{
+					{
+						Tag:   utils.StringPointer("randomTag"),
+						Path:  utils.StringPointer("randomPath"),
+						Type:  utils.StringPointer(utils.MetaTemplate),
+						Value: utils.StringPointer("randomTemplate"),
+					},
+				},
+			},
+		},
+	}
+	expectedFields := LoaderSCfgs{
+		{
+			Data: []*LoaderDataType{
+				{
+					Fields: []*FCTemplate{
+						{
+							Tag:       "TenantID",
+							Path:      "Tenant",
+							Type:      utils.MetaVariable,
+							Value:     NewRSRParsersMustCompile("~*req.0", utils.INFIELD_SEP),
+							Mandatory: true,
+						},
+					},
+				},
+			},
+		},
+	}
+	msgTemplates := map[string][]*FCTemplate{
+		"randomTemplate": {
+			{
+				Tag:       "TenantID",
+				Path:      "Tenant",
+				Type:      utils.MetaVariable,
+				Value:     NewRSRParsersMustCompile("~*req.0", utils.INFIELD_SEP),
+				Mandatory: true,
+			},
+		},
+	}
+	if jsonCfg, err := NewDefaultCGRConfig(); err != nil {
+		t.Error(err)
+	} else if err = jsonCfg.loaderCfg[0].loadFromJsonCfg(cfgJson, msgTemplates, jsonCfg.generalCfg.RSRSep); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(jsonCfg.loaderCfg[0].Data[0].Fields[0], expectedFields[0].Data[0].Fields[0]) {
+		t.Errorf("Expected %+v \n, received %+v", utils.ToJSON(expectedFields[0].Data[0].Fields[0]), utils.ToJSON(jsonCfg.loaderCfg[0].Data[0].Fields[0]))
+	}
+}
+
+func TestLoaderSCfgloadFromJsonCfgCase6(t *testing.T) {
+	cfgJson := &LoaderJsonCfg{
+		Data: &[]*LoaderJsonDataType{nil},
+	}
+	if jsonCfg, err := NewDefaultCGRConfig(); err != nil {
+		t.Error(err)
+	} else if err = jsonCfg.loaderCfg[0].loadFromJsonCfg(cfgJson, jsonCfg.templates, jsonCfg.generalCfg.RSRSep); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestEnabledCase1(t *testing.T) {
+	jsonCfg, err := NewDefaultCGRConfig()
+	if err != nil {
+		t.Error(err)
+	}
+	if enabled := jsonCfg.loaderCfg.Enabled(); enabled {
+		t.Errorf("Expected %+v", enabled)
+	}
+}
+func TestEnabledCase2(t *testing.T) {
+	cfgJSONStr := `{
+			"loaders": [												
+	{
+		"enabled": true,
+		},
+	],	
+}`
+	if jsonCfg, err := NewCGRConfigFromJsonStringWithDefaults(cfgJSONStr); err != nil {
+		t.Error(err)
+	} else if enabled := jsonCfg.loaderCfg.Enabled(); !enabled {
+		t.Errorf("Expected %+v", enabled)
+	}
+}
+
+func TestLoaderCfgAsMapInterfaceCase1(t *testing.T) {
 	cfgJSONStr := `{
 			"loaders": [												
 	{
 		"id": "*default",									
 		"enabled": false,									
-		"tenant": "",										
+		"tenant": "~*req.Destination1",										
 		"dry_run": false,									
 		"run_delay": 0,										
 		"lock_filename": ".cgr.lck",						
-		"caches_conns": ["*internal"],
+		"caches_conns": ["*internal:*caches"],
 		"field_separator": ",",								
 		"tp_in_dir": "/var/spool/cgrates/loader/in",		
 		"tp_out_dir": "/var/spool/cgrates/loader/out",		
@@ -130,11 +273,11 @@ func TestLoaderCfgAsMapInterface(t *testing.T) {
 		{
 			utils.IdCfg:             "*default",
 			utils.EnabledCfg:        false,
-			utils.TenantCfg:         "",
+			utils.TenantCfg:         "~*req.Destination1",
 			utils.DryRunCfg:         false,
 			utils.RunDelayCfg:       "0",
 			utils.LockFileNameCfg:   ".cgr.lck",
-			utils.CachesConnsCfg:    []string{"*internal"},
+			utils.CachesConnsCfg:    []string{utils.MetaInternal},
 			utils.FieldSeparatorCfg: ",",
 			utils.TpInDirCfg:        "/var/spool/cgrates/loader/in",
 			utils.TpOutDirCfg:       "/var/spool/cgrates/loader/out",
@@ -174,11 +317,80 @@ func TestLoaderCfgAsMapInterface(t *testing.T) {
 			t.Errorf("Expected %+v \n, received %+v", utils.ToJSON(eMap[0][utils.DataCfg].([]map[string]interface{})[0][utils.FieldsCfg].([]map[string]interface{})[1]),
 				utils.ToJSON(rcv[0][utils.DataCfg].([]map[string]interface{})[0][utils.FieldsCfg].([]map[string]interface{})[1]))
 		} else if !reflect.DeepEqual(eMap[0][utils.CachesConnsCfg], rcv[0][utils.CachesConnsCfg]) {
-			t.Errorf("Expecetd %+v, received %+v", eMap[0][utils.CachesConnsCfg], rcv[0][utils.CachesConnsCfg])
+			t.Errorf("Expected %+v, received %+v", eMap[0][utils.CachesConnsCfg], rcv[0][utils.CachesConnsCfg])
 		} else if !reflect.DeepEqual(eMap[0][utils.TpInDirCfg], rcv[0][utils.TpInDirCfg]) {
-			t.Errorf("Expecetd %+v, received %+v", eMap[0][utils.TpInDirCfg], rcv[0][utils.TpInDirCfg])
+			t.Errorf("Expected %+v, received %+v", eMap[0][utils.TpInDirCfg], rcv[0][utils.TpInDirCfg])
 		} else if !reflect.DeepEqual(eMap[0][utils.LockFileNameCfg], rcv[0][utils.LockFileNameCfg]) {
-			t.Errorf("Expecetd %+v, received %+v", eMap[0][utils.LockFileNameCfg], rcv[0][utils.LockFileNameCfg])
+			t.Errorf("Expected %+v, received %+v", eMap[0][utils.LockFileNameCfg], rcv[0][utils.LockFileNameCfg])
 		}
 	}
 }
+
+func TestLoaderCfgAsMapInterfaceCase2(t *testing.T) {
+	cfgJSONStr := `{
+			"loaders": [												
+	{
+		"id": "*default",									
+		"enabled": false,									
+		"tenant": "~*req.Destination1",										
+		"dry_run": false,									
+		"run_delay": 1,										
+		"lock_filename": ".cgr.lck",						
+		"caches_conns": ["*conn1"],
+		"field_separator": ",",								
+		"tp_in_dir": "/var/spool/cgrates/loader/in",		
+		"tp_out_dir": "/var/spool/cgrates/loader/out",		
+		"data":[											
+			{
+				"type": "*attributes",						
+				"file_name": "Attributes.csv",				
+				"fields": [
+					{"tag": "TenantID", "path": "Tenant", "type": "*variable", "value": "~req.0", "mandatory": true},
+					{"tag": "ProfileID", "path": "ID", "type": "*variable", "value": "~*req.1", "mandatory": true},
+					],
+				},
+			],
+		},
+	],	
+}`
+	eMap := []map[string]interface{}{
+		{
+			utils.IdCfg:             "*default",
+			utils.EnabledCfg:        false,
+			utils.TenantCfg:         "~*req.Destination1",
+			utils.DryRunCfg:         false,
+			utils.RunDelayCfg:       "0",
+			utils.LockFileNameCfg:   ".cgr.lck",
+			utils.CachesConnsCfg:    []string{"*conn1"},
+			utils.FieldSeparatorCfg: ",",
+			utils.TpInDirCfg:        "/var/spool/cgrates/loader/in",
+			utils.TpOutDirCfg:       "/var/spool/cgrates/loader/out",
+			utils.DataCfg: []map[string]interface{}{
+				{
+					utils.TypeCfg:     "*attributes",
+					utils.FilenameCfg: "Attributes.csv",
+					utils.FieldsCfg: []map[string]interface{}{
+						{
+							utils.TagCfg:       "TenantID",
+							utils.PathCfg:      "Tenant",
+							utils.TypeCfg:      "*variable",
+							utils.ValueCfg:     "~*req.0",
+							utils.MandatoryCfg: true,
+						}, {
+							utils.TagCfg:       "ProfileID",
+							utils.PathCfg:      "ID",
+							utils.TypeCfg:      "*variable",
+							utils.ValueCfg:     "~*req.1",
+							utils.MandatoryCfg: true,
+						},
+					},
+				},
+			},
+		},
+	}
+	if jsonCfg, err := NewCGRConfigFromJsonStringWithDefaults(cfgJSONStr); err != nil {
+		t.Error(err)
+	} else if rcv := jsonCfg.loaderCfg.AsMapInterface(jsonCfg.generalCfg.RSRSep); !reflect.DeepEqual(rcv[0][utils.Tenant], eMap[0][utils.Tenant]) {
+		t.Errorf("Expected %+v, received %+v", rcv[0][utils.Tenant], eMap[0][utils.Tenant])
+	}
+}