Make lines of sales, subscriptions and purchases read only without a company and currency

Closes #13948

modules/purchase/purchase.py

@@ -155,8 +155,14 @@ class Purchase(
             'readonly': ((Eval('state') != 'draft')
                 | (Eval('lines', [0]) & Eval('currency'))),
             })
-    lines = fields.One2Many('purchase.line', 'purchase', 'Lines',
-        states=_states)
+    lines = fields.One2Many(
+        'purchase.line', 'purchase', "Lines",
+        states={
+            'readonly': (
+                (Eval('state') != 'draft')
+                | ~Eval('company')
+                | ~Eval('currency')),
+            })
     line_lines = fields.One2Many(
         'purchase.line', 'purchase', "Line - Lines", readonly=True,
         filter=[

modules/sale/sale.py

@@ -212,10 +212,14 @@ class Sale(
             'readonly': ((Eval('state') != 'draft')
                 | (Eval('lines', [0]) & Eval('currency', 0))),
             })
-    lines = fields.One2Many('sale.line', 'sale', 'Lines', states={
-            'readonly': Eval('state') != 'draft',
-            },
-        depends={'party'})
+    lines = fields.One2Many(
+        'sale.line', 'sale', "Lines",
+        states={
+            'readonly': (
+                (Eval('state') != 'draft')
+                | ~Eval('company')
+                | ~Eval('currency')),
+            })
     line_lines = fields.One2Many(
         'sale.line', 'sale', "Line - Lines", readonly=True,
         filter=[

modules/sale_subscription/subscription.py

@@ -145,8 +145,11 @@ class Subscription(Workflow, ModelSQL, ModelView):
     lines = fields.One2Many(
         'sale.subscription.line', 'subscription', "Lines",
         states={
-            'readonly': ((Eval('state') != 'draft')
-                | ~Eval('start_date')),
+            'readonly': (
+                (Eval('state') != 'draft')
+                | ~Eval('start_date')
+                | ~Eval('company')
+                | ~Eval('currency')),
             })
 
     quoted_by = employee_field(