diff --git a/silkaj/tx.py b/silkaj/tx.py
index 5bac90ba886b2a0fe517c97e629ef35d871cca70..14e5676451b4c24e8e212641505f3ce4ad7a544f 100644
--- a/silkaj/tx.py
+++ b/silkaj/tx.py
@@ -194,7 +194,6 @@ def check_transaction_values(
         if ct.check_public_key(outputAddress, True) is False:
             tools.message_exit(outputAddress)
     if outputBackChange:
-        outputBackChange = ct.check_public_key(outputBackChange, True)
         if ct.check_public_key(outputBackChange, True) is False:
             tools.message_exit(outputBackChange)
     if enough_source:
diff --git a/tests/test_unit_tx.py b/tests/test_unit_tx.py
index d132608eb01cd38f0e95236591e2036fc233e89c..539444146a332363b32447e5ace8afe8f58e628d 100644
--- a/tests/test_unit_tx.py
+++ b/tests/test_unit_tx.py
@@ -14,6 +14,7 @@ from silkaj.tx import (
     send_transaction,
     generate_and_send_transaction,
     display_sent_tx,
+    check_transaction_values,
 )
 from silkaj.tui import display_amount, display_pubkey
 from silkaj.money import UDValue
@@ -1238,3 +1239,98 @@ async def test_generate_and_send_transaction(
         with pytest.raises(SystemExit) as pytest_exit:
             await function_testing()
         assert pytest_exit.type == SystemExit
+
+
+# test check_transaction_values()
+@pytest.mark.parametrize(
+    "comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey",
+    [
+        ("Test", ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",), "", False, "A",),
+        (
+            "Test",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",),
+            "HcRgKh4LwbQVYuAc3xAdCynYXpKoiPE6qdxCMa8JeHat",
+            False,
+            "A",
+        ),
+    ],
+)
+def test_check_transaction_values(
+    comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey, capsys
+):
+    check_transaction_values(
+        comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey
+    )
+    assert capsys.readouterr().out == ""
+
+
+# test check_transaction_values()
+@pytest.mark.parametrize(
+    "comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey",
+    [
+        (
+            "Wrong_Char_é",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",),
+            "",
+            False,
+            "A",
+        ),
+        ("Test", ("Wrong_Pubkey",), "", False, "A",),
+        (
+            "Test",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw", "Wrong_Pubkey",),
+            "HcRgKh4LwbQVYuAc3xAdCynYXpKoiPE6qdxCMa8JeHat",
+            False,
+            "A",
+        ),
+        (
+            "Test",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",),
+            "Wrong_Pubkey",
+            False,
+            "A",
+        ),
+        (
+            "Test",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",),
+            "HcRgKh4LwbQVYuAc3xAdCynYXpKoiPE6qdxCMa8JeHat",
+            True,
+            "A",
+        ),
+        (
+            "Too_Long_Comment_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+            ("DBM6F5ChMJzpmkUdL5zD9UXKExmZGfQ1AgPDQy4MxSBw",),
+            "HcRgKh4LwbQVYuAc3xAdCynYXpKoiPE6qdxCMa8JeHat",
+            False,
+            "A",
+        ),
+    ],
+)
+def test_check_transaction_values_errors(
+    comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey, capsys
+):
+    with pytest.raises(SystemExit) as pytest_exit:
+        check_transaction_values(
+            comment, outputAddresses, outputBackChange, enough_source, issuer_pubkey
+        )
+        display = capsys.readouterr()
+        if comment.find("Wrong_Char_") != -1:
+            assert display == "Error: the format of the comment is invalid"
+        elif comment.find("Too_Long_Comment_") != -1:
+            assert display == "Error: the format of the comment is invalid"
+        elif "Wrong_Pubkey" in outputAddresses:
+            assert display.out.find("Error: bad format for following public key:") != -1
+        elif outputBackChange:
+            if outputBackChange == "Wrong_Pubkey":
+                assert (
+                    display.out.find("Error: bad format for following public key:")
+                    != -1
+                )
+        elif enough_source is True:
+            assert (
+                display.out.find(
+                    "pubkey doesn’t have enough money for this transaction."
+                )
+                != -1
+            )
+    assert pytest_exit.type == SystemExit