Solution : https://service.sap.com/sap/support/notes/184521 (SAP Service marketplace login required)
Key words :
unexpected exception calling function module isu_o_cs_meterread_action, sheet meter reading data, meter reading data, meter reading order, error message e9887, additional key words, sm order allocated, meter readings, 'reset' button, pressing 'save'
Related Notes :
| 184757 | EC51: Meter reading entry - default values |
| 183321 | Collective note f. IS-U/CCS 1.2 - add-on patch 015 |