GR-based IV and ERS
1) A PO is created on Sept15th(say). Then a GR has been done on Sept 20th.(say). While the PO was created, then it was non-ERS. Now after receiving of goods, say on Sept 25th, we check ERS by ME22n. Now , since now it is ERS, will the system now generate an invoice whose GR has been done in the past? Please explain.
2)Is it mandatory to have GR-based IV in case of ERS and vice versa? Say, if it is non-ERS, and we have GR-based IV, will there be any problem in invoice posting? Please explain.