diff --git a/rsconcept/backend/apps/rsform/models/Constituenta.py b/rsconcept/backend/apps/rsform/models/Constituenta.py
index 83c51d78..37bf348f 100644
--- a/rsconcept/backend/apps/rsform/models/Constituenta.py
+++ b/rsconcept/backend/apps/rsform/models/Constituenta.py
@@ -1,4 +1,6 @@
 ''' Models: Constituenta. '''
+import re
+
 from django.db.models import (
     CASCADE, ForeignKey, Model, PositiveIntegerField,
     TextChoices, TextField, CharField, JSONField
@@ -6,6 +8,12 @@ from django.db.models import (
 from django.core.validators import MinValueValidator
 from django.urls import reverse
 
+from ..utils import apply_pattern
+
+
+_REF_ENTITY_PATTERN = re.compile(r'@{([^0-9\-].*?)\|.*?}')
+_GLOBAL_ID_PATTERN = re.compile(r'([XCSADFPT][0-9]+)') # cspell:disable-line
+
 
 class CstType(TextChoices):
     ''' Type of constituenta '''
@@ -99,3 +107,26 @@ class Constituenta(Model):
             return
         self.term_resolved = new_term
         self.term_forms = []
+
+    def apply_mapping(self, mapping: dict[str, str], change_aliases: bool = False):
+        modified = False
+        if change_aliases and self.alias in mapping:
+            modified = True
+            self.alias = mapping[self.alias]
+        expression = apply_pattern(self.definition_formal, mapping, _GLOBAL_ID_PATTERN)
+        if expression != self.definition_formal:
+            modified = True
+            self.definition_formal = expression
+        convention = apply_pattern(self.convention, mapping, _GLOBAL_ID_PATTERN)
+        if convention != self.convention:
+            modified = True
+            self.convention = convention
+        term = apply_pattern(self.term_raw, mapping, _REF_ENTITY_PATTERN)
+        if term != self.term_raw:
+            modified = True
+            self.term_raw = term
+        definition = apply_pattern(self.definition_raw, mapping, _REF_ENTITY_PATTERN)
+        if definition != self.definition_raw:
+            modified = True
+            self.definition_raw = definition
+        return modified
diff --git a/rsconcept/backend/apps/rsform/models/api_RSForm.py b/rsconcept/backend/apps/rsform/models/api_RSForm.py
index 448fcc62..5e50c352 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSForm.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSForm.py
@@ -1,6 +1,4 @@
 ''' Models: RSForm API. '''
-import re
-
 from typing import Iterable, Optional, cast
 
 from django.db import transaction
@@ -13,14 +11,9 @@ from .Constituenta import CstType, Constituenta
 from .Version import Version
 
 from ..graph import Graph
-from ..utils import apply_pattern
 from .. import messages as msg
 
 
-_REF_ENTITY_PATTERN = re.compile(r'@{([^0-9\-].*?)\|.*?}')
-_GLOBAL_ID_PATTERN = re.compile(r'([XCSADFPT][0-9]+)') # cspell:disable-line
-
-
 def _get_type_prefix(cst_type: CstType) -> str:
     ''' Get alias prefix. '''
     if cst_type == CstType.BASE:
@@ -243,27 +236,7 @@ class RSForm:
         ''' Apply rename mapping. '''
         cst_list = self.constituents().order_by('order')
         for cst in cst_list:
-            modified = False
-            if change_aliases and cst.alias in mapping:
-                modified = True
-                cst.alias = mapping[cst.alias]
-            expression = apply_pattern(cst.definition_formal, mapping, _GLOBAL_ID_PATTERN)
-            if expression != cst.definition_formal:
-                modified = True
-                cst.definition_formal = expression
-            convention = apply_pattern(cst.convention, mapping, _GLOBAL_ID_PATTERN)
-            if convention != cst.convention:
-                modified = True
-                cst.convention = convention
-            term = apply_pattern(cst.term_raw, mapping, _REF_ENTITY_PATTERN)
-            if term != cst.term_raw:
-                modified = True
-                cst.term_raw = term
-            definition = apply_pattern(cst.definition_raw, mapping, _REF_ENTITY_PATTERN)
-            if definition != cst.definition_raw:
-                modified = True
-                cst.definition_raw = definition
-            if modified:
+            if cst.apply_mapping(mapping, change_aliases):
                 cst.save()
 
     @transaction.atomic