diff --git a/api/inp_in.py b/api/inp_in.py
index fe24282..df5fe45 100644
--- a/api/inp_in.py
+++ b/api/inp_in.py
@@ -272,6 +272,9 @@ def parse_file(project: str, inp: str, version: str = '3') -> None:
 
 
 def read_inp(project: str, inp: str, version: str = '3') -> bool:
+    if version != '3' and version != '2':
+        version = '2'
+
     if is_project_open(project):
        close_project(project)
 
@@ -293,6 +296,9 @@ def read_inp(project: str, inp: str, version: str = '3') -> bool:
 
 
 def import_inp(project: str, cs: ChangeSet, version: str = '3') -> bool:
+    if version != '3' and version != '2':
+        version = '2'
+
     if 'inp' not in cs.operations[0]:
         return False
 
diff --git a/api/inp_out.py b/api/inp_out.py
index d6a5774..8aef8d8 100644
--- a/api/inp_out.py
+++ b/api/inp_out.py
@@ -33,6 +33,9 @@ from .s27_backdrop import inp_out_backdrop
 
 
 def dump_inp(project: str, inp: str, version: str = '3'):
+    if version != '3' and version != '2':
+        version = '2'
+
     if not have_project(project):
        return
 
@@ -145,6 +148,9 @@ def dump_inp(project: str, inp: str, version: str = '3'):
 
 
 def export_inp(project: str, version: str = '3') -> ChangeSet:
+    if version != '3' and version != '2':
+        version = '2'
+
     if not have_project(project):
        return ChangeSet()