Assign screen variable to ABAP

Example :

  DATA : li_xvepo TYPE TABLE OF VEPOVB.

  FIELD-SYMBOLS: <fi_xvepo> TYPE ANY.

  ASSIGN ('(SAPLV51P)GT_XVEPO') TO <fi_xvepo>.
  IF <fi_xvepo> IS ASSIGNED.
    MOVE <fi_xvepo> TO li_xvepo.
  ENDIF.

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