diff --git a/golden/expected_osv_parse/synthetic/s40_flat_header_account.json b/golden/expected_osv_parse/synthetic/s40_flat_header_account.json
index 2110597..bd2b6f3 100644
--- a/golden/expected_osv_parse/synthetic/s40_flat_header_account.json
+++ b/golden/expected_osv_parse/synthetic/s40_flat_header_account.json
@@ -134,8 +134,8 @@
           "data_type": null,
           "opening_debit": "1000.00",
           "opening_credit": "200.00",
-          "turnover_debit": "650.00",
-          "turnover_credit": "750.00",
+          "turnover_debit": null,
+          "turnover_credit": null,
           "closing_debit": "1200.00",
           "closing_credit": "500.00",
           "extra": null
diff --git a/golden/expected_osv_parse/synthetic/s41_flat_chart_of_accounts.json b/golden/expected_osv_parse/synthetic/s41_flat_chart_of_accounts.json
index d8667f5..feee383 100644
--- a/golden/expected_osv_parse/synthetic/s41_flat_chart_of_accounts.json
+++ b/golden/expected_osv_parse/synthetic/s41_flat_chart_of_accounts.json
@@ -115,8 +115,8 @@
           "data_type": null,
           "opening_debit": "820.21",
           "opening_credit": "2763.79",
-          "turnover_debit": "5000.00",
-          "turnover_credit": "4991.00",
+          "turnover_debit": null,
+          "turnover_credit": null,
           "closing_debit": "829.21",
           "closing_credit": "2763.79",
           "extra": null
diff --git a/golden/expected_osv_parse/synthetic/s42_subaccounts_totals_reversed.json b/golden/expected_osv_parse/synthetic/s42_subaccounts_totals_reversed.json
index 3f0da6a..5923127 100644
--- a/golden/expected_osv_parse/synthetic/s42_subaccounts_totals_reversed.json
+++ b/golden/expected_osv_parse/synthetic/s42_subaccounts_totals_reversed.json
@@ -149,8 +149,8 @@
           "data_type": null,
           "opening_debit": "1000.00",
           "opening_credit": "300.00",
-          "turnover_debit": "5700.00",
-          "turnover_credit": "6600.00",
+          "turnover_debit": null,
+          "turnover_credit": null,
           "closing_debit": null,
           "closing_credit": "200.00",
           "extra": null
diff --git a/osv/synthetic/s40_flat_header_account.xlsx b/osv/synthetic/s40_flat_header_account.xlsx
index f16d040..5f201a3 100644
Binary files a/osv/synthetic/s40_flat_header_account.xlsx and b/osv/synthetic/s40_flat_header_account.xlsx differ
diff --git a/osv/synthetic/s41_flat_chart_of_accounts.xlsx b/osv/synthetic/s41_flat_chart_of_accounts.xlsx
index 2757364..258c5f4 100644
Binary files a/osv/synthetic/s41_flat_chart_of_accounts.xlsx and b/osv/synthetic/s41_flat_chart_of_accounts.xlsx differ
diff --git a/osv/synthetic/s42_subaccounts_totals_reversed.xlsx b/osv/synthetic/s42_subaccounts_totals_reversed.xlsx
index 510a9d4..e6dc7f5 100644
Binary files a/osv/synthetic/s42_subaccounts_totals_reversed.xlsx and b/osv/synthetic/s42_subaccounts_totals_reversed.xlsx differ