feat(custom-fields): purchase e-taxes comment + serial fields

Add etaxes_invoice_series/number (read-only) and etaxes_invoice_comment_2 on
Purchase Invoice and Purchase Order, plus a general-purpose remarks field on
Purchase Order (comment 1) placed at the same spot as the standard PI remarks.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

jey_erp/custom_fields.py

@@ -488,6 +488,45 @@ def create_custom_fields():
                 options='\n310\n311\n314\n316',
                 insert_after='ygb',
                 depends_on='eval:doc.purchase_type || doc.agricultural_goods'
+            ),
+
+            # Purchase Order has no standard `remarks`, so comment 1 gets a
+            # dedicated general-purpose field placed at the SAME spot as the
+            # standard Purchase Invoice `remarks` (right before connections_tab).
+            dict(
+                fieldname='remarks',
+                label='Remarks',
+                fieldtype='Small Text',
+                insert_after='is_old_subcontracting_flow'
+            ),
+
+            # === E-TAXES INVOICE INFO (imported from e-taxes) ===
+            dict(
+                fieldname='etaxes_invoice_info_section',
+                label='E-Taxes Invoice Info',
+                fieldtype='Section Break',
+                insert_after='line_code',
+                collapsible=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_series',
+                label='Seriyə',
+                fieldtype='Data',
+                insert_after='etaxes_invoice_info_section',
+                read_only=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_number',
+                label='Nömrə',
+                fieldtype='Data',
+                insert_after='etaxes_invoice_series',
+                read_only=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_comment_2',
+                label='Additional Comment',
+                fieldtype='Small Text',
+                insert_after='etaxes_invoice_number'
             )
         ],
         "Purchase Invoice": [
@@ -547,6 +586,37 @@ def create_custom_fields():
                 depends_on='eval:doc.purchase_type || doc.agricultural_goods'
             ),
 
+            # === E-TAXES INVOICE INFO (imported from e-taxes) ===
+            # Series/number are parsed from the e-taxes serialNumber on import.
+            # Comment 1 lands in the standard `remarks` field; comment 2 here.
+            dict(
+                fieldname='etaxes_invoice_info_section',
+                label='E-Taxes Invoice Info',
+                fieldtype='Section Break',
+                insert_after='line_code',
+                collapsible=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_series',
+                label='Seriyə',
+                fieldtype='Data',
+                insert_after='etaxes_invoice_info_section',
+                read_only=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_number',
+                label='Nömrə',
+                fieldtype='Data',
+                insert_after='etaxes_invoice_series',
+                read_only=1
+            ),
+            dict(
+                fieldname='etaxes_invoice_comment_2',
+                label='Additional Comment',
+                fieldtype='Small Text',
+                insert_after='etaxes_invoice_number'
+            ),
+
             # === E-TAXES PURCHASE ACT SECTION ===
             dict(
                 fieldname='etaxes_agricultural_section',