Solution : https://service.sap.com/sap/support/notes/325579 (SAP Service marketplace login required)
Key words :
additional key words time_out, user exit cnex0012, endless loop occurs, attached program correction, external number assignment, external number, program error, network number, number range, project builder
Related Notes :
| 384128 | Call of CNEX0012 with edited WBS element no. II |
| 340000 | Creating network w/ external number: MESSAGE_TYPE_X |