Remove not needed PurchaseInvoiceLine model

issue6047
review34461002

__init__.py

@@ -9,7 +9,6 @@ from .invoice import *
 def register():
     Pool.register(
         Purchase,
-        PurchaseInvoiceLine,
         PurchaseIgnoredInvoiceLine,
         InvoiceLine,
         module='purchase_invoice_line_standalone', type_='model')

purchase.py

@@ -7,7 +7,7 @@ from trytond.model import ModelSQL, fields
 from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
 
-__all__ = ['Purchase', 'PurchaseInvoiceLine', 'PurchaseIgnoredInvoiceLine',
+__all__ = ['Purchase', 'PurchaseIgnoredInvoiceLine',
     'HandleInvoiceException']
 
 
@@ -91,16 +91,6 @@ class Purchase:
         return super(Purchase, cls).copy(purchases, default=default)
 
 
-class PurchaseInvoiceLine(ModelSQL):
-    'Purchase - Invoice Line'
-    __name__ = 'purchase.purchase-account.invoice.line'
-    _table = 'purchase_invoice_line_rel'
-    purchase = fields.Many2One('purchase.purchase', 'Purchase',
-            ondelete='CASCADE', select=True, required=True)
-    line = fields.Many2One('account.invoice.line', 'Invoice Line',
-            ondelete='RESTRICT', select=True, required=True)
-
-
 class PurchaseIgnoredInvoiceLine(ModelSQL):
     'Purchase - Ignored Invoice Line'
     __name__ = 'purchase.purchase-ignored-account.invoice.line'