SAP Message BL235 - Disp. prof.: Field cat. lev. &1: Struct. &2 does not exist (see long txt)

Application Log: Display logs: The level &V1& field catalog (LEV&V1&_FCAT) is incorrectly defined indisplay profile I_S_DISPLAY_PROFILE. Entry &V3& has DDIC structure name: REF_TABLE: &V2& This structure is either non-existent (or inactive) or not flat(contains nested structures or tables).