fix: asset validation misfire on debit notes

[ruthra-kumar]

1. Make Purchase Invoice and Cancel it.
2. Amend it. Enable Is Return(Debit Note) and save

request.js:457 Traceback (most recent call last):
  File "apps/frappe/frappe/app.py", line 95, in application
    response = frappe.api.handle()
  File "apps/frappe/frappe/api.py", line 54, in handle
    return frappe.handler.handle()
  File "apps/frappe/frappe/handler.py", line 47, in handle
    data = execute_cmd(cmd)
  File "apps/frappe/frappe/handler.py", line 85, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
  File "apps/frappe/frappe/__init__.py", line 1622, in call
    return fn(*args, **newargs)
  File "apps/frappe/frappe/desk/form/save.py", line 28, in savedocs
    doc.save()
  File "apps/frappe/frappe/model/document.py", line 307, in save
    return self._save(*args, **kwargs)
  File "apps/frappe/frappe/model/document.py", line 329, in _save
    return self.insert()
  File "apps/frappe/frappe/model/document.py", line 261, in insert
    self.run_before_save_methods()
  File "apps/frappe/frappe/model/document.py", line 1053, in run_before_save_methods
    self.run_method("validate")
  File "apps/frappe/frappe/model/document.py", line 917, in run_method
    out = Document.hook(fn)(self, *args, **kwargs)
  File "apps/frappe/frappe/model/document.py", line 1279, in composer
    return composed(self, method, *args, **kwargs)
  File "apps/frappe/frappe/model/document.py", line 1261, in runner
    add_to_return_value(self, fn(self, *args, **kwargs))
  File "apps/frappe/frappe/model/document.py", line 914, in fn
    return method_object(*args, **kwargs)
  File "apps/erpnext/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py", line 91, in validate
    super(PurchaseInvoice, self).validate()
  File "apps/erpnext/erpnext/controllers/buying_controller.py", line 45, in validate
    self.validate_asset_return()
  File "apps/erpnext/erpnext/controllers/buying_controller.py", line 170, in validate_asset_return
    frappe.throw(
  File "apps/frappe/frappe/__init__.py", line 534, in throw
    msgprint(
  File "apps/frappe/frappe/__init__.py", line 502, in msgprint
    _raise_exception()
  File "apps/frappe/frappe/__init__.py", line 451, in _raise_exception
    raise raise_exception(msg)
frappe.exceptions.ValidationError:  has submitted assets linked to it. You need to cancel the assets to create purchase return.

[codecov]

Codecov Report

Merging #37108 (097b989) into develop (2dbdc40) will increase coverage by 0.00%.
Report is 37 commits behind head on develop.
The diff coverage is 69.11%.

@@            Coverage Diff            @@
##           develop   #37108    +/-   ##
=========================================
  Coverage    66.49%   66.50%            
=========================================
  Files          791      793     +2     
  Lines        62315    62435   +120     
=========================================
+ Hits         41436    41520    +84     
- Misses       20879    20915    +36     

Files Changed	Coverage
...xt/accounts/doctype/payment_entry/payment_entry.py	ø
...xt/accounts/doctype/sales_invoice/sales_invoice.py	ø
erpnext/controllers/accounts_controller.py	33.33%
...ctype/unreconcile_payments/unreconcile_payments.py	55.73%
erpnext/accounts/utils.py	97.91%
...ile_payment_entries/unreconcile_payment_entries.py	100.00%
erpnext/controllers/buying_controller.py	100.00%