diff --git a/examples/priority_model_explicit_customized.conf b/examples/priority_model_explicit_customized.conf
new file mode 100644
index 000000000..c12040c88
--- /dev/null
+++ b/examples/priority_model_explicit_customized.conf
@@ -0,0 +1,14 @@
+[request_definition]
+r = subject, obj, act
+
+[policy_definition]
+p = priority, obj, act, eft, subject
+
+[role_definition]
+g = _, _
+
+[policy_effect]
+e = priority(p.eft) || deny
+
+[matchers]
+m = g(r.subject, p.subject) && r.obj == p.obj && r.act == p.act
\ No newline at end of file
diff --git a/examples/priority_policy_explicit_customized.csv b/examples/priority_policy_explicit_customized.csv
new file mode 100644
index 000000000..a861e2ba7
--- /dev/null
+++ b/examples/priority_policy_explicit_customized.csv
@@ -0,0 +1,12 @@
+p, 10, data1, read, deny, data1_deny_group
+p, 10, data1, write, deny, data1_deny_group
+p, 10, data2, read, allow, data2_allow_group
+p, 10, data2, write, allow, data2_allow_group
+
+
+p, 1, data1, write, allow, alice
+p, 1, data1, read, allow, alice
+p, 1, data2, read, deny, bob
+
+g, bob, data2_allow_group
+g, alice, data1_deny_group
diff --git a/rbac_api_test.go b/rbac_api_test.go
index b2ba1b819..41ab44f0e 100644
--- a/rbac_api_test.go
+++ b/rbac_api_test.go
@@ -15,6 +15,7 @@
 package casbin
 
 import (
+	"github.com/casbin/casbin/v2/constant"
 	"sort"
 	"testing"
 
@@ -461,3 +462,57 @@ func testGetImplicitUsersForRole(t *testing.T, e *Enforcer, name string, res []s
 		t.Error("Implicit users for ", name, ": ", myRes, ", supposed to be ", res)
 	}
 }
+
+func TestExplicitPriorityModify(t *testing.T) {
+	e, _ := NewEnforcer("examples/priority_model_explicit.conf", "examples/priority_policy_explicit.csv")
+
+	testEnforce(t, e, "bob", "data2", "write", true)
+	_, err := e.AddPolicy("1", "bob", "data2", "write", "deny")
+	if err != nil {
+		t.Fatalf("AddPolicy: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", false)
+
+	_, err = e.DeletePermissionsForUser("bob")
+	if err != nil {
+		t.Fatalf("DeletePermissionForUser: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", true)
+
+	_, err = e.DeleteRole("data2_allow_group")
+	if err != nil {
+		t.Fatalf("DeleteRole: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", false)
+}
+
+func TestCustomizedFieldIndex(t *testing.T) {
+	e, _ := NewEnforcer("examples/priority_model_explicit_customized.conf",
+		"examples/priority_policy_explicit_customized.csv")
+
+	testEnforce(t, e, "bob", "data2", "write", true)
+	_, err := e.AddPolicy("1", "data2", "write", "deny", "bob")
+	if err != nil {
+		t.Fatalf("AddPolicy: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", false)
+
+	_, err = e.DeletePermissionsForUser("bob")
+	if err == nil {
+		t.Fatalf("Failed to warning SetFieldIndex")
+	}
+
+	e.SetFieldIndex("p", constant.SubjectIndex, 4)
+
+	_, err = e.DeletePermissionsForUser("bob")
+	if err != nil {
+		t.Fatalf("DeletePermissionForUser: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", true)
+
+	_, err = e.DeleteRole("data2_allow_group")
+	if err != nil {
+		t.Fatalf("DeleteRole: %v", err)
+	}
+	testEnforce(t, e, "bob", "data2", "write", false)
+}