Solution : https://service.sap.com/sap/support/notes/104626 (SAP Service marketplace login required)
Key words : 
additional key words wmmbid01, symptom goods receipts, lower case letters, mobile data entry, idoc/bapi expects, idoc/bapi call, idoc processing, respective interface, processed online, object type
Related Notes : 
       
| 338627 | Cancellation of the source code from Note 104626 | 
| 213066 | Subsequent note implementation Support Package 3.1I |