diff --git a/account_banking_pain_base/models/account_payment_line.py b/account_banking_pain_base/models/account_payment_line.py
index c430b5cff..a460b9551 100644
--- a/account_banking_pain_base/models/account_payment_line.py
+++ b/account_banking_pain_base/models/account_payment_line.py
@@ -15,10 +15,47 @@ class AccountPaymentLine(models.Model):
         string='Priority', default='NORM',
         help="This field will be used as 'Instruction Priority' in "
              "the generated PAIN file.")
-    # local_instrument is used in some countries, for example
-    # switzerland, cf l10n_ch_sepa that adds some entries in
-    # the selection field
+    # local_instrument is used for instant credit transfers which
+    # will begin on November 2017, cf account_banking_sepa_credit_transfer
+    # It is also used in some countries such as switzerland,
+    # cf l10n_ch_pain_base that adds some entries in the selection field
     local_instrument = fields.Selection([], string='Local Instrument')
+    category_purpose = fields.Selection([
+        # Full category purpose list found on:
+        # https://www.iso20022.org/external_code_list.page
+        # Document "External Code Sets spreadsheet" version Feb 8th 2017
+        ('BONU', 'Bonus Payment'),
+        ('CASH', 'Cash Management Transfer'),
+        ('CBLK', 'Card Bulk Clearing'),
+        ('CCRD', 'Credit Card Payment'),
+        ('CORT', 'Trade Settlement Payment'),
+        ('DCRD', 'Debit Card Payment'),
+        ('DIVI', 'Dividend'),
+        ('DVPM', 'Deliver Against Payment'),
+        ('EPAY', 'ePayment'),
+        ('FCOL', 'Fee Collection'),
+        ('GOVT', 'Government Payment'),
+        ('HEDG', 'Hedging'),
+        ('ICCP', 'Irrevocable Credit Card Payment'),
+        ('IDCP', 'Irrevocable Debit Card Payment'),
+        ('INTC', 'Intra-Company Payment'),
+        ('INTE', 'Interest'),
+        ('LOAN', 'Loan'),
+        ('OTHR', 'Other Payment'),
+        ('PENS', 'Pension Payment'),
+        ('RVPM', 'Receive Against Payment'),
+        ('SALA', 'Salary Payment'),
+        ('SECU', 'Securities'),
+        ('SSBE', 'Social Security Benefit'),
+        ('SUPP', 'Supplier Payment'),
+        ('TAXS', 'Tax Payment'),
+        ('TRAD', 'Trade'),
+        ('TREA', 'Treasury Payment'),
+        ('VATX', 'VAT Payment'),
+        ('WHLD', 'WithHolding'),
+        ], string="Category Purpose",
+        help="If neither your bank nor your local regulations oblige you to "
+        "set the category purpose, leave the field empty.")
     # PAIN allows 140 characters
     communication = fields.Char(size=140)
     # The field struct_communication_type has been dropped in v9
diff --git a/account_banking_pain_base/models/account_payment_order.py b/account_banking_pain_base/models/account_payment_order.py
index 4e62f6a99..751096e22 100644
--- a/account_banking_pain_base/models/account_payment_order.py
+++ b/account_banking_pain_base/models/account_payment_order.py
@@ -203,8 +203,8 @@ class AccountPaymentOrder(models.Model):
     @api.model
     def generate_start_payment_info_block(
             self, parent_node, payment_info_ident,
-            priority, local_instrument, sequence_type, requested_date,
-            eval_ctx, gen_args):
+            priority, local_instrument, category_purpose, sequence_type,
+            requested_date, eval_ctx, gen_args):
         payment_info = etree.SubElement(parent_node, 'PmtInf')
         payment_info_identification = etree.SubElement(
             payment_info, 'PmtInfId')
@@ -249,7 +249,12 @@ class AccountPaymentOrder(models.Model):
             sequence_type_node = etree.SubElement(
                 payment_type_info, 'SeqTp')
             sequence_type_node.text = sequence_type
-
+        if category_purpose:
+            category_purpose_node = etree.SubElement(
+                payment_type_info, 'CtgyPurp')
+            category_purpose_code = etree.SubElement(
+                category_purpose_node, 'Cd')
+            category_purpose_code.text = category_purpose
         if gen_args['payment_method'] == 'DD':
             request_date_tag = 'ReqdColltnDt'
         else:
diff --git a/account_banking_pain_base/models/bank_payment_line.py b/account_banking_pain_base/models/bank_payment_line.py
index dde080637..c055ac5b4 100644
--- a/account_banking_pain_base/models/bank_payment_line.py
+++ b/account_banking_pain_base/models/bank_payment_line.py
@@ -13,10 +13,12 @@ class BankPaymentLine(models.Model):
     local_instrument = fields.Selection(
         related='payment_line_ids.local_instrument',
         string='Local Instrument')
+    category_purpose = fields.Selection(
+        related='payment_line_ids.category_purpose', string='Category Purpose')
 
     @api.model
     def same_fields_payment_line_and_bank_payment_line(self):
         res = super(BankPaymentLine, self).\
             same_fields_payment_line_and_bank_payment_line()
-        res += ['priority', 'local_instrument']
+        res += ['priority', 'local_instrument', 'category_purpose']
         return res
diff --git a/account_banking_pain_base/views/account_payment_line.xml b/account_banking_pain_base/views/account_payment_line.xml
index e84958e63..925f43e49 100644
--- a/account_banking_pain_base/views/account_payment_line.xml
+++ b/account_banking_pain_base/views/account_payment_line.xml
@@ -13,7 +13,8 @@
     <field name="arch" type="xml">
         <field name="communication_type" position="before">
             <field name="priority"/>
-            <field name="local_instrument" invisible="1"/>
+            <field name="local_instrument"/>
+            <field name="category_purpose"/>
         </field>
     </field>
 </record>
diff --git a/account_banking_pain_base/views/bank_payment_line_view.xml b/account_banking_pain_base/views/bank_payment_line_view.xml
index f9496dffd..d6d05a9b3 100644
--- a/account_banking_pain_base/views/bank_payment_line_view.xml
+++ b/account_banking_pain_base/views/bank_payment_line_view.xml
@@ -13,7 +13,8 @@
     <field name="arch" type="xml">
         <field name="partner_bank_id" position="after">
             <field name="priority"/>
-            <field name="local_instrument" invisible="1"/>
+            <field name="local_instrument"/>
+            <field name="category_purpose"/>
         </field>
     </field>
 </record>