Solution : https://service.sap.com/sap/support/notes/849584 (SAP Service marketplace login required)
Key words :
entered material number, prerequisites program error, dynpro_msg_in_help dump occurs, attached code correction, code correction, terms dynpro_msg_in_help, problem occurs, invoice tab, item details, ekpo-mwskz
Related Notes :
1175497 | F4 help MWSKZ in FB01 ME21N ME31K for CoCd w/o Plants Abroad |
804933 | ME21 - Reporting country pop up for plants abroad active |