You are not able to change the Posting Date of a Cancellation Invoice because the field is grayed out.
Reproducing the Issue
- Go to Customer Invoicing work center;
- Go to Invoice Documents view;
- Search for Invoice ABC;
- Click Edit button;
- Click Cancel button;
- Click View All button.
Posting Date field is grayed out.
This is a feature provided with FP1308 onwards, where Posting Date of the Cancellation Invoice will be "Read Only", if the Accounting Period of the canceled Invoice is open.
This has been done to make sure the Invoice and the Cancellation Invoice fall into the same Accounting Period.
This is the expected system behavior.
KBA , AP-CI , Customer Invoice Processing , How To