diff --git a/advlabdb/adminModelViews.py b/advlabdb/adminModelViews.py
index 548de33..c7907ef 100644
--- a/advlabdb/adminModelViews.py
+++ b/advlabdb/adminModelViews.py
@@ -5,7 +5,7 @@ from flask_admin.helpers import get_form_data
 from flask_admin.menu import MenuLink
 from flask_admin.model.template import EndpointLinkRowAction
 from flask_security import admin_change_password, current_user, hash_password
-from sqlalchemy import func, or_
+from sqlalchemy import func, or_, and_
 from wtforms import BooleanField, Form, RadioField, SelectField, TextField
 from wtforms.fields.html5 import DateField
 from wtforms.validators import URL, DataRequired, Email, NumberRange, Optional
@@ -371,7 +371,12 @@ class GroupView(SecureAdminModelView):
         else:
 
             def query_factory():
-                return partStudentQueryFactory().filter(or_(PartStudent.group == None, PartStudent.group == group))
+                return partStudentQueryFactory().filter(
+                    or_(
+                        and_(PartStudent.group == None, PartStudent.part.has(Part.program == group.program)),
+                        PartStudent.group == group,
+                    )
+                )
 
         class CustomForm(Form):
             part_students = QuerySelectMultipleField(
diff --git a/advlabdb/models.py b/advlabdb/models.py
index 6e00f72..18c19a3 100644
--- a/advlabdb/models.py
+++ b/advlabdb/models.py
@@ -95,18 +95,14 @@ class Group(db.Model):
 
     def check(part_students, program=None):
         commonProgram = part_students[0].part.program
+
         if program and program != commonProgram:
             raise DataBaseException("Group's program and students' program mismatch!")
 
-        commonSemester = part_students[0].part.semester
-
         for partStudent in part_students[1:]:
             if partStudent.part.program != commonProgram:
                 raise DataBaseException(f"Part Students {part_students} are not in the same program!")
 
-            if partStudent.part.semester != commonSemester:
-                raise DataBaseException(f"Part Students {part_students} are not in the same semester!")
-
     def customInit(part_students):
         Group.check(part_students)