diff --git a/tests/bugs/core_4200_test.py b/tests/bugs/core_4200_test.py
index 4ec787be..03b5d538 100644
--- a/tests/bugs/core_4200_test.py
+++ b/tests/bugs/core_4200_test.py
@@ -7,6 +7,13 @@ TITLE:       An uncommitted select of the pseudo table sec$users blocks new data
 DESCRIPTION:
 JIRA:        CORE-4200
 FBTEST:      bugs.core_4200
+NOTES:
+    [08.12.2023] pzotov
+    Removed excessive split: code for FB 3.x and 4.x is identical.
+    Initial version of test (.in FBT framework) was created 29 may 2015, so one may to assume
+    that bug was fixed at that time. Current QA uses firebird-driver which has no ability to
+    make connection to such ancient FB version (3.0 Alpha1 ?). This means that we can not check
+    whether this test can reproduce source problem.
 """
 
 import pytest
@@ -20,38 +27,6 @@ user_leg = user_factory('db', name='tmp$c4200_leg', password='123', plugin='Lega
 
 act = python_act('db')
 
-expected_stdout_1 = """
-WHO_AM_I                        TMP$C4200_LEG
-AUTH_METHOD                     Leg
-
-WHO_AM_I                        TMP$C4200_SRP
-AUTH_METHOD                     Srp
-"""
-
-@pytest.mark.version('>=3.0,<4')
-def test_1(act: Action, user_srp: User, user_leg: User, capsys):
-    act.expected_stdout = expected_stdout_1
-    check_sql='select mon$user as who_am_i, left(mon$auth_method,3) as auth_method from mon$attachments'
-    custom_tpb = tpb(isolation=Isolation.READ_COMMITTED_RECORD_VERSION, lock_timeout=0)
-    #
-    with act.db.connect() as con1:
-        trn1 = con1.transaction_manager(custom_tpb)
-        cur1 = trn1.cursor()
-        cur1.execute('select sec$user_name from sec$users').fetchall()
-        with act.db.connect(user=user_leg.name, password=user_leg.password) as con2, \
-             act.db.connect(user=user_srp.name, password=user_srp.password) as con3:
-            trn2 = con2.transaction_manager(custom_tpb)
-            cur2 = trn2.cursor()
-            act.print_data_list(cur2.execute(check_sql))
-            #
-            trn3 = con3.transaction_manager(custom_tpb)
-            cur3 = trn3.cursor()
-            act.print_data_list(cur3.execute(check_sql))
-    act.stdout = capsys.readouterr().out
-    assert act.clean_stdout == act.clean_expected_stdout
-
-# Version: 4.0
-
 expected_stdout_2 = """
 WHO_AM_I                        TMP$C4200_LEG
 AUTH_METHOD                     Leg
@@ -60,7 +35,7 @@ WHO_AM_I                        TMP$C4200_SRP
 AUTH_METHOD                     Srp
 """
 
-@pytest.mark.version('>=4.0')
+@pytest.mark.version('>=3.0')
 def test_2(act: Action, user_srp: User, user_leg: User, capsys):
     act.expected_stdout = expected_stdout_2
     check_sql='select mon$user as who_am_i, left(mon$auth_method,3) as auth_method from mon$attachments'