Solution : https://service.sap.com/sap/support/notes/536461 (SAP Service marketplace login required)
Key words :
validation / substitution topic, related notes exist, related notes, notes listed, project system
Related Notes :
| 548218 | Bad performance during substitution/mass change/BAPI/ |
| 495269 | Poor performance for substitution /mass change/ ... |
| 440186 | FAQ 2: Validation and substitution in the project |