Allow edit quantity for transferred transaction

Scenario:

In a Sales transaction, once the transaction has been transferred, you cannot edit the quantity. For instance, if a Delivery Order has already been transferred to a Sales Invoice, you cannot change the quantity.

Is there a way for users to modify the quantity after it's been transferred?

Solution 

Maintenance > System Options > Sales 

• Allow to edit quantity for transferred document – Quotation 

• Allow to edit quantity for transferred document – Sales Order  

• Allow to edit quantity for transferred document – Delivery Order

Tick the option that you would like to edit.  

Example, allow to edit quantity for transferred document – Delivery Order  

So that, user allow to edit the quantity even though is has been transferred to Invoice

Note:
For Purchase transaction, please set under Maintenance > System Options > Purchases

• Allow to edit quantity for transferred document – Purchase Requisition

• Allow to edit quantity for transferred document – Purchase Order

• Allow to edit quantity for transferred document – Goods Received Note