old_contents: import frappe, re
  from frappe import _
  from erpnext.regional.india import states, state_numbers
  
  def validate_gstin_for_india(doc, method):
  	if not hasattr(doc, 'gstin'):
  		return
  
  	if doc.gstin:
  		doc.gstin = doc.gstin.upper()
  		if doc.gstin != "NA":
  			p = re.compile("[0-9]{2}[a-zA-Z]{5}[0-9]{4}[a-zA-Z]{1}[1-9A-Za-z]{1}[Z]{1}[0-9a-zA-Z]{1}")
  			if not p.match(doc.gstin):
  				frappe.throw(_("Invalid GSTIN or Enter NA for Unregistered"))
  
  		if not doc.gst_state:
  			if doc.state in states:
  				doc.gst_state = doc.state
  
  		if doc.gst_state and doc.gstin != "NA":
  			doc.gst_state_number = state_numbers[doc.gst_state]
  			if doc.gst_state_number != doc.gstin[:2]:
  				frappe.throw(_("First 2 digits of GSTIN should match with State number {0}")
  					.format(doc.gst_state_number))
new_contents: import frappe, re
  from frappe import _
  from erpnext.regional.india import states, state_numbers
  
  def validate_gstin_for_india(doc, method):
  	if not hasattr(doc, 'gstin'):
  		return
  
  	if doc.gstin:
  		doc.gstin = doc.gstin.upper()
  		if doc.gstin != "NA":
  			p = re.compile("[0-9]{2}[a-zA-Z]{5}[0-9]{4}[a-zA-Z]{1}[1-9A-Za-z]{1}[Z]{1}[0-9a-zA-Z]{1}")
  			if not p.match(doc.gstin):
  				frappe.throw(_("Invalid GSTIN or Enter NA for Unregistered"))
  
  		if not doc.gst_state:
  			if doc.state in states:
  				doc.gst_state = doc.state
  
  		if doc.gst_state:
  			doc.gst_state_number = state_numbers[doc.gst_state]
  			if doc.gstin != "NA" and doc.gst_state_number != doc.gstin[:2]:
  				frappe.throw(_("First 2 digits of GSTIN should match with State number {0}")
  					.format(doc.gst_state_number))
  
subject: Update utils.py