Solution : https://service.sap.com/sap/support/notes/875166 (SAP Service marketplace login required)
Key words :
index fields short text subrecn substance key mandt client pvguid identifier, index fields short text mandt client pvguid internal number, pvs variant pvtype ippe variant type save, pvs variant save, type index, internal number, mandt field, symptom long runtimes, substances' tab page, call transaction se11
Related Notes :
| 863007 | Indexes missing in database tables |
| 857563 | Performance when reading the substances of a formula |