SAP Function WRF_APC_ADD_ITEM_EXISTING_ART - pop up screen to add an item with an existing article

Parameter	Reference	Type	Length	Text
EX_MATNR	MATNR	C	18	Material Number

Exception	Text
CX_WRF_APC_DIALOG_EXCEPTIONS	Operational APC - Dialog Process Exceptions
CX_WRF_APC_ROOT_EXCEPTIONS	Operational APC - Global common exceptions