Solution : https://service.sap.com/sap/support/notes/180193 (SAP Service marketplace login required)
Key words :
system generates error message e9890 'internal error, reading internal table x_prei, additional key words proration, price class table, rental price, price classes, target step, transferred completely, isu_settle_price_determine', prerequisites
Related Notes :
| 189165 | Improvements proration III |
| 179590 | Collective note f. IS-U/CCS 1.2, add-on patch 014 |
| 179585 | Collective note for IS-U/CCS 4.51, add-on patch 003 |
| 179470 | Proration dates with dependent schema steps |
| 169580 | Termination in variant SETTLE01 with error E9890 |
| 164336 | Terminations in rental price variants |