Of course u can not inform but this is warning for both 2 departments with 2 e-mails .
And the point is;
-Beloew reservations invoices requested by price department without e-mail and reason .
-The closed invoice reguested to open and we are waiting information from contract manager to close the invoice again .
So please note ,
-Hotel invoices are not under the responsibiity of contract department .
-Especially if we (price department ,reservation department ,accounting ) dont have any mistake .We dont need to inform or take help from contract department to contact with hotel .
I can understand that it is easy to work without writing e-mail but I think this case is really good example for the importance of e-mails .