Hi Bilal,
Once you cancel the 'Released' Invoice Document and save the 'New Cancelation Invoice' ,it will make the status of preceding Invoice Request back to 'To be Invoiced'.
But , now if you try to click "invoice" on it ,it opens New Invoice Document screen .But ALL the Tax details (fields) will NOT be editable .
***Note: The field to be Editable depend on Invoice Request Type.
For e.g : 1.If Invoice Request if of type 'Manual Invoice Request' ,then on Invoicing it most of the fields will be editable.
2.But if Invoice Request depends on preceding document i.e. of type Outbound Delivery Invoice Request/Service Confirmation Invoice Request etc.., most of field can't be editable while Invoicing this Invoice Request.
***Proposal:=>
1.You have to 'Cancel' the preceding document for e.g Outbound Delivery /Service Confirmation.This will cancel the status of related Outbound Delivery Invoice Request/Service Confirmation Invoice Request and further prevent it from Invoicing it.
Hope this answer and explain the behavior.
Best Regards,
Ankush Pashine.