Solution : https://service.sap.com/sap/support/notes/75134 (SAP Service marketplace login required)
Key words :
object number objnr = o1, additional key words cor1, exit pi sheet, process order resulted, process order, planned order, process management, message bs027, release transaction, planning table
Related Notes :
| 191279 | Operation: Status WCRE, although resource allowed |
| 155885 | Status CREF is not set in operation |
| 97534 |