Com um único campo no UI5, é enviada a informação e o filtro ocorre em vários campos do ABAP

View

<SearchField id="searchField" showRefreshButton="true" search=".onSearch" width="auto">

Controller

this._oListFilterState = {
	aFilter: [],
	aSearch: []
};

onSearch: function (oEvent) {
	if (oEvent.getParameters().refreshButtonPressed) {
		// Search field's 'refresh' button has been pressed.
		// This is visible if you select any master list item.
		// In this case no new search is triggered, we only
		// refresh the list binding.
		this.onRefresh();
		return;
	}

	var sQuery = oEvent.getParameter("query");

	if (sQuery) {
		this._oListFilterState.aSearch = [new Filter({
			filters: [
				new Filter("Pernr", FilterOperator.Contains, sQuery),
				new Filter("Cname", FilterOperator.Contains, sQuery),
				new Filter("IdItem", FilterOperator.Contains, sQuery)
			],
			and: true
		})];
	} else {
		this._oListFilterState.aSearch = [];
	}

	this._applyFilterSearch();
},

_applyFilterSearch: function () {
	var aFilters = this._oListFilterState.aSearch.concat(this._oListFilterState.aFilter),
		oViewModel = this.getModel("masterView");
	this._oList.getBinding("items").filter(aFilters, sap.ui.model.FilterType.Application);
}

ABAP

data(lt_list) = get_any_table_of_entityset_type( ).

loop at it_filter_select_options into data(ls_filter).
  data(lv_tabix) = sy-tabix.
  loop at ls_filter-select_options into data(ls_filter_item).
    lv_where = cond #( when lv_where is initial
                then |{ from_mixed( val = ls_filter-property sep = '_' ) } { ls_filter_item-option } '{ ls_filter_item-low }'|
                else |{ lv_where } or { from_mixed( val = ls_filter-property sep = '_' ) } { ls_filter_item-option } '{ ls_filter_item-low }'| ).
  endloop.
endloop.
  
loop at lt_list into data(ls_list) where (lv_where).
  append ls_list to et_entityset.
endloop.