diff --git a/kapital_bank/bank_api.py b/kapital_bank/bank_api.py
index b0ad19f..625ee3a 100644
--- a/kapital_bank/bank_api.py
+++ b/kapital_bank/bank_api.py
@@ -658,6 +658,16 @@ def create_unmapped_customers(settings_name=None):
         if not unmapped:
             return {"success": True, "created_count": 0, "message": "No unmapped customers in table to create"}
 
+        # Validate config upfront — clearer than ERPNext's cryptic
+        # "Could not find Customer Group" thrown deep inside party creation.
+        for mapping, _kb_customer in unmapped:
+            group = mapping.customer_group or doc.default_customer_group
+            if not group or not frappe.db.exists("Customer Group", group):
+                return {"success": False, "message": "Set a Default Customer Group on Kapital Bank Settings (or a Customer Group on each customer mapping row) before creating customers."}
+            territory = mapping.territory or doc.default_territory
+            if not territory or not frappe.db.exists("Territory", territory):
+                return {"success": False, "message": "Set a Default Territory on Kapital Bank Settings (or a Territory on each customer mapping row) before creating customers."}
+
         created = 0
         for mapping, kb_customer in unmapped:
             try:
@@ -668,16 +678,8 @@ def create_unmapped_customers(settings_name=None):
                 party = frappe.new_doc("Customer")
                 party.customer_name = customer_name
                 party.customer_type = "Company"
-
-                customer_group = mapping.customer_group or doc.default_customer_group
-                if not customer_group or not frappe.db.exists("Customer Group", customer_group):
-                    customer_group = "All Customer Groups"
-                party.customer_group = customer_group
-
-                territory = mapping.territory or doc.default_territory or "All Territories"
-                if not frappe.db.exists("Territory", territory):
-                    territory = "All Territories"
-                party.territory = territory
+                party.customer_group = mapping.customer_group or doc.default_customer_group
+                party.territory = mapping.territory or doc.default_territory
 
                 if kb_customer.tax_id:
                     party.tax_id = kb_customer.tax_id
@@ -733,6 +735,11 @@ def create_unmapped_suppliers(settings_name=None):
         if not unmapped:
             return {"success": True, "created_count": 0, "message": "No unmapped suppliers in table to create"}
 
+        for mapping, _kb_supplier in unmapped:
+            group = mapping.supplier_group or doc.default_supplier_group
+            if not group or not frappe.db.exists("Supplier Group", group):
+                return {"success": False, "message": "Set a Default Supplier Group on Kapital Bank Settings (or a Supplier Group on each supplier mapping row) before creating suppliers."}
+
         created = 0
         for mapping, kb_supplier in unmapped:
             try:
@@ -743,11 +750,7 @@ def create_unmapped_suppliers(settings_name=None):
                 party = frappe.new_doc("Supplier")
                 party.supplier_name = supplier_name
                 party.supplier_type = "Company"
-
-                supplier_group = mapping.supplier_group or doc.default_supplier_group
-                if not supplier_group or not frappe.db.exists("Supplier Group", supplier_group):
-                    supplier_group = "All Supplier Groups"
-                party.supplier_group = supplier_group
+                party.supplier_group = mapping.supplier_group or doc.default_supplier_group
 
                 if kb_supplier.tax_id:
                     party.tax_id = kb_supplier.tax_id
@@ -859,6 +862,14 @@ def create_unmapped_accounts(settings_name=None):
 		default_bank = doc.default_bank
 		default_company = doc.default_company
 
+		# Bank Account requires both Company and Bank — surface a clear message
+		# instead of ERPNext's mandatory-field error mid-creation.
+		if any(not frappe.db.exists("Bank Account", {"bank_account_no": r.iban}) for r in unmapped):
+			if not default_company:
+				return {"success": False, "message": "Set a Default Company on Kapital Bank Settings before creating Bank Accounts."}
+			if not default_bank:
+				return {"success": False, "message": "Set a Default Bank on Kapital Bank Settings before creating Bank Accounts."}
+
 		created = 0
 		for row in unmapped:
 			try:
@@ -978,6 +989,12 @@ def create_unmapped_cards(settings_name=None):
 		default_bank = doc.default_bank
 		default_company = doc.default_company
 
+		if any(not frappe.db.exists("Bank Account", {"bank_account_no": r.account_number}) for r in unmapped):
+			if not default_company:
+				return {"success": False, "message": "Set a Default Company on Kapital Bank Settings before creating Bank Accounts."}
+			if not default_bank:
+				return {"success": False, "message": "Set a Default Bank on Kapital Bank Settings before creating Bank Accounts."}
+
 		created = 0
 		for row in unmapped:
 			try: