Add new patch issue11989.diff.

FIX patch issue11937.diff.

Task #073038

issue11937.diff

@@ -1,6 +1,6 @@
 --- a/tryton/trytond/trytond/worker.py
 +++ b/tryton/trytond/trytond/worker.py
-@@ -73,7 +73,10 @@
+@@ -73,7 +73,10 @@ def work(options):
              while len(tasks.filter()) >= processes:
                  time.sleep(0.1)
              for queue in queues:
@@ -9,7 +9,7 @@
 +                    task_id, next_ = queue.pull(options.name)
 +                except backend.DatabaseOperationalError:
 +                    break
-                 timeout = min(
-                     next_ or options.timeout, timeout, options.timeout)
+                 if next_ is not None:
+                     timeout = min(next_, timeout)
                  if task_id:
 

issue11989.diff

@@ -0,0 +1,17 @@
+diff --git a/tryton/modules/purchase_request/purchase.py b/tryton/modules/purchase_request/purchase.py
+index 63425351b4..a63b557763 100644
+--- a/tryton/modules/purchase_request/purchase.py
++++ b/tryton/modules/purchase_request/purchase.py
+@@ -26,6 +26,12 @@ def process_request(func):
+ class Purchase(metaclass=PoolMeta):
+     __name__ = 'purchase.purchase'
+ 
++    @classmethod
++    def copy(cls, lines, default=None):
++        default = default.copy() if default is not None else {}
++        default.setdefault('requests')
++        return super().copy(lines, default=default)
++
+     @classmethod
+     def delete(cls, purchases):
+         cls.check_delete_purchase_request(purchases)

series

@@ -36,3 +36,5 @@ issue11931.diff # [stock_lot] Allow to deactivate lot
 issue11868.diff # [account] Add on delete CASCADE to lines and keywords of move template
 
 issue11582.diff # [trytond] Add authentication services
+
+issue11989.diff # [purchase_request] Clear requests when copying purchase lines