only calculate exchange rate if necessary
use transaction cache

remove useless test_21
update test_20 with various packing list

multiple owner test case
multiple cancel packing list test
circular movement test

(cherry picked from commit 27126964)

Let's use reference_date_method_id on Trade Model Paths.

* Code clean up
* Remove hardcoded ledger to pick date
* Add code to defined source section when none is defined

* Fix for special case where purchase packing list is root.

* Use getSourceAssetPriceCurrency
* Do not expand if no SourceAssetPrice

Called by TransformationSimulationRule and did not work with the
following use case (where child_BL1):

  BL(trade_phase=TP1, successor=trade_state/TS1):
    * child_BL1(predecessor=trade_state/TS1,
                trade_phase=TP1/InventoryAccounting)
    * child_BL3(predecessor=trade_state/TS1,
                trade_phase=Transforming)

erp5_mrp: Manufacturing Order Portal Type should have its own init script so that it can be customized independently of Production Order.

Project use case: Use modification_date instead of operation_date to export
ATs modified the day before.

Such as:
  - getStartTransitionDateList() and getStartTransitionDate().
  - getDeliverTransitionDateList() and getDeliveryTransitionDate().
  - ...

Where the non-List accessors returned the last element.

Use Case: Set AT.{start,stop}_date from PPL stop transition date.