diff --git a/application/Espo/Modules/Crm/Resources/metadata/entityDefs/Opportunity.json b/application/Espo/Modules/Crm/Resources/metadata/entityDefs/Opportunity.json
index 2a4cac11c4..ca96d1d2c4 100644
--- a/application/Espo/Modules/Crm/Resources/metadata/entityDefs/Opportunity.json
+++ b/application/Espo/Modules/Crm/Resources/metadata/entityDefs/Opportunity.json
@@ -53,9 +53,9 @@
             "max": 100
         },
         "leadSource": {
-            "type": "varchar",
+            "type": "enum",
             "view": "Crm:Opportunity.Fields.LeadSource",
-            "customizationDisabled": true
+            "customizationOptionsDisabled": true
         },
         "closeDate": {
             "type": "date",
diff --git a/frontend/client/src/views/admin/field-manager/edit.js b/frontend/client/src/views/admin/field-manager/edit.js
index 098af48c09..61b43ac99c 100644
--- a/frontend/client/src/views/admin/field-manager/edit.js
+++ b/frontend/client/src/views/admin/field-manager/edit.js
@@ -87,7 +87,16 @@ Espo.define('views/admin/field-manager/edit', ['view', 'model'], function (Dep,
                     this.defs = model.defs.fields[this.field];
                 }
 
-                this.params = this.getFieldManager().getParams(this.type) || [];
+                this.params = [];
+                var params = this.getFieldManager().getParams(this.type) || [];
+                params.forEach(function (o) {
+                    var item = o.name;
+                    var disableParamName = 'customization' + Espo.Utils.upperCaseFirst(item) + 'Disabled';
+                    if (this.getMetadata().get('entityDefs.' + this.scope + '.fields.' + this.field + '.' + disableParamName)) {
+                        return;
+                    }
+                    this.params.push(o);
+                }, this);
 
                 this.params.forEach(function (o) {
                     this.model.defs.fields[o.name] = o;