frappe/erpnext — pull request #2173 by ankitjavalkarwork (2014-09-10 10:32:39+00:00)
Title: Add message on cancel in SI if C-Form exists, fix minor error, Add validation in C-Form

- Add msgprint on Sales Invoice cancellation if a C-form exists against current Sales Invoice
- Add validation in C-form to check if the Invoice number is cancelled