add format version (data type)
diff --git a/erpnext/regional/report/datev/datev.py b/erpnext/regional/report/datev/datev.py
index abbc56b..a3cc180 100644
--- a/erpnext/regional/report/datev/datev.py
+++ b/erpnext/regional/report/datev/datev.py
@@ -291,7 +291,7 @@
 		csv_class.DATA_CATEGORY,
 		csv_class.FORMAT_NAME,
 		# E = Format version (regarding format name)
-		"",
+		csv_class.FORMAT_VERSION,
 		# F = Generated on
 		datetime.datetime.now().strftime("%Y%m%d"),
 		# G = Imported on -- stays empty
diff --git a/erpnext/regional/report/datev/datev_constants.py b/erpnext/regional/report/datev/datev_constants.py
index 1c9bd23..1ca480c 100644
--- a/erpnext/regional/report/datev/datev_constants.py
+++ b/erpnext/regional/report/datev/datev_constants.py
@@ -499,14 +499,17 @@
 class Transactions():
 	DATA_CATEGORY = DataCategory.TRANSACTIONS
 	FORMAT_NAME = FormatName.TRANSACTIONS
+	FORMAT_VERSION = "9"
 	COLUMNS = TRANSACTION_COLUMNS
 
 class DebtorsCreditors():
 	DATA_CATEGORY = DataCategory.DEBTORS_CREDITORS
 	FORMAT_NAME = FormatName.DEBTORS_CREDITORS
+	FORMAT_VERSION = "5"
 	COLUMNS = DEBTOR_CREDITOR_COLUMNS
 
 class AccountNames():
 	DATA_CATEGORY = DataCategory.ACCOUNT_NAMES
 	FORMAT_NAME = FormatName.ACCOUNT_NAMES
+	FORMAT_VERSION = "2"
 	COLUMNS = ACCOUNT_NAME_COLUMNS