3654441 - A EWM inactive IDN is rejected but the ECC IBD is not zeroed out

The user rejects an inactive IDN via the tcode /scwm/idn, but the ECC IBD is not zeroed out, the IDN has an unprocessed PPF action "Send ERP Delivery Messages". There is a dump in tcode ST22 as following:
Category                         ABAP programming error
Runtime Errors                MOVE_CAST_ERROR
Except.                           CX_SY_MOVE_CAST_ERROR
ABAP Program                 /SCWM/CL_DLV_SERVICES=========CP
Application Component    SCM-EWM-DLP

Short Text
          Dynamic type conflict during the assignment of references.

Source Code:
Method

   IF lo_item IS BOUND.
>>>     lo_item_prd ?= ls_item-item.
     lo_item_prd->get_sapext( IMPORTING es_sapext_i = ls_sapext_i ).
     lo_item_prd->get_sapext( IMPORTING es_sapext_o = ls_sapext_o ).
     IF ls_sapext_i-/scwm/flup_cntrl CA 'EFG' OR ls_sapext_o-/scwm/flup_cntrl CA 'EFG'.
       ev_is_arm_dlv = abap_true.
     ENDIF.

SAP Extended Warehouse Management (SCM-EWM)

/SCWM/MSG_DR_RESPONSE, dump, reject IDN not update ERP, /scwm/prdi, reject, unprocessed PPF action. , KBA , SCM-EWM-IF , Interfaces , Problem