[UI] Settings to contrl editing of "completed" orders

[SchrodingersGat]

As a hangover from the old user interface we have the following global settings:

• PURCHASEORDER_EDIT_COMPLETED_ORDERS
• SALESORDER_EDIT_COMPLETED_ORDERS
• RETURNORDER_EDIT_COMPLETED_ORDERS

If enabled, the intent is that the line items for the particular orders cannot be edited once the order has been "completed".

This was only ever a UI limitation - no back-end or API restrictions were enforced.

The question is:

• Do we wish to re-implement this concept for the new user interface?
• Do we remove these three settings

@matmair @wolflu05 any particular strong feelings here? My preference would be to remove them.

[matmair]

@SchrodingersGat my intuitive expectation would be that this locking is the default behavior.

Good that we found this with the refactor - I can volunteer to re-implement it if that is the outcome we come too. Long term I would like to have a generalized locking system but that is v3 territory probably.

[SchrodingersGat]

@matmair ok, let's go with:

Immediate - re-implement this as a UI feature, optionally locking the line items from being edited if the order is completed or cancelled
Longer term - checks are performed on the backend / general purpose "locking" system