Solution : https://service.sap.com/sap/support/notes/724064 (SAP Service marketplace login required)
Key words :
abap runtime error convt_no_number occurs, swp_callback_wi_done function module, bo<objtype><event>, asynchronous steps hang, support package sapkb62039, support package 38, terms saplswp1, lswp1u56 reason, correction instructions, sapkb62039
Related Notes :
| 722711 | Syntax error in LFCIWCAU01 |
| 711722 | Problems when steps are set to obsolete |