Invoice creation on Balancing Unit Specific

Dear Experts,

My Client have ten balancing segments and they name as Units, each unit has data entry officer who enters the payable invoices and it will route to different officers for approvals. Now the User says that if Unit A enters the bill, this information should have access only for that unit officers only and most important thing is any invoice is created under Invoice Batch only. In short if Unit A data entry Officer has created Invoices under Batch, then the second officer(who is senior to data entry) after logging into the concerned responsibility the system should show only the