Electricity Billing Period. Column Process with a label Surcharge is use to process the surcharge for every Rental Invoices that are unpaid. Every cut-off payment usually every 5th day of the month, you need to press the Surcharge like button to process a surcharge. Once you press the Surcharge it will turn to red background with no label after processing and it is unclickable.
Also column AdmCharge is an amount (in percentage) use to add an additional charge in electricity consumption per kilowatt hour. Example if the kilowatt hour of electricity is 6/kwhr adding an admin charge (AdmCharge) of 40 will give a total consumption of 6 + 40% of 6 = 8.4/kwhr.