Solution : https://service.sap.com/sap/support/notes/188210 (SAP Service marketplace login required)
Key words : 
additional key words el28, solution apply aop016, meter reading result, meter reader payment, meter reading estimation, meter reading, apply aop006, meter reader, meter readings, changed due
Related Notes : 
       
| 187264 | Collective note f. IS-U/CCS 4.51 - add-on patch 006 | 
| 187260 | Collective note for IS-U/CCS 1. - AOP 016 |