diff --git a/jey_erp/custom_fields.py b/jey_erp/custom_fields.py
index 66302b0..da1d2fb 100644
--- a/jey_erp/custom_fields.py
+++ b/jey_erp/custom_fields.py
@@ -11,6 +11,32 @@ def create_custom_fields():
                 insert_after='status'
             )
         ],
+        "Purchase Order": [
+            dict(
+                fieldname='is_taxes_doc',
+                label='Is taxes document',
+                fieldtype='Check',
+                insert_after='is_subcontracted',
+                hidden=1
+            ),
+            dict(
+                fieldname='taxes_doc',
+                label='taxes_doc',
+                fieldtype='Link',
+                options='E-Taxes Purchase',
+                insert_after='is_taxes_doc',
+                hidden=1
+            )
+        ],
+        "Purchase Invoice": [
+            dict(
+                fieldname='is_taxes_doc',
+                label='Is taxes document',
+                fieldtype='Check',
+                insert_after='is_paid',
+                hidden=0
+            )
+        ],
         "Bank": [
             dict(
                 fieldname='bank_code',