User do not want records of cancelled lines at invoice creation stage

Summary:

For user it becomes difficult to analyze the accounting impact of that invoice since cancelled lines also impacts accounting. so User wants delete Lines option at invoice creation stage i.e BEFORE VALIDATION STAGE .

Content (required):

Lets say user Created one line , now for some reason need to cancel it then only option is cancel that line and due to which that lines is generated and it also has impact on accounting entry . so we want to delete those lines at creation stage only

We have seen that after Tax we are not able to delete lines before VALIDATION STAGE