Solution : https://service.sap.com/sap/support/notes/83575 (SAP Service marketplace login required)
Key words :
system generates error message v0104, additional key words cj20, prerequisites advance development solution 1, requested function alue, project planning board, number range defined, external number assignment, external number, structure planning, network number
Related Notes :
| 188038 | CJ20, CJ2B: PLNAW_UNKNOWN_LCOVGFFR |
| 44632 | Popup for ext. no. assignment in structure planning |