implement example how SAP Cloud SDK filter can be combined

srv/bp-service.cds

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+using {API_BUSINESS_PARTNER as external} from './external/API_BUSINESS_PARTNER';
+
+service BusinessPartnerService {
+
+  entity BusinessPartner as projection on external.A_BusinessPartner;
+
+  function getAllBusinessPartners() returns String;
+
+}

srv/bp-service.js

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+const cds = require("@sap/cds");
+const LOG = cds.log("bp-service");
+
+const {
+  BusinessPartner: sdkBusinessPartner,
+  BusinessPartnerAddress: sdkBusinessPartnerAddress,
+  batch: bpBatch,
+} = require("./odata-client/business-partner-service");
+const { or, and } = require("@sap-cloud-sdk/core");
+
+module.exports = async function () {
+  this.on("READ", "BusinessPartner", async (req) => {
+    const bpService = await cds.connect.to("API_BUSINESS_PARTNER");
+    return bpService.run(req.query);
+  });
+
+  this.on("getAllBusinessPartners", async (req) => {
+    LOG._info && LOG.info("getAllBusinessPartners");
+    // Mock filter data
+    const bps = ["203", "1018"];
+    const countries = ["DE", "US"];
+
+    // Create SAP Cloud SDK Filter for BusinessPartner
+    const bpFilter = bps.map((bp) =>
+      sdkBusinessPartnerAddress.BUSINESS_PARTNER.equals(bp)
+    );
+    const filter = [or(...bpFilter)];
+
+    // Create SAP Cloud SDK Filter for Country
+    if (countries.length > 0) {
+      const countryFilter = countries.map((country) =>
+        sdkBusinessPartnerAddress.COUNTRY.equals(country)
+      );
+      filter.push(or(...countryFilter));
+    }
+    LOG._debug && LOG.debug("filter", JSON.stringify(filter));
+    const queryBuilderBPAddress = sdkBusinessPartnerAddress
+      .requestBuilder()
+      .getAll()
+      .select(
+        sdkBusinessPartnerAddress.BUSINESS_PARTNER,
+        sdkBusinessPartnerAddress.COUNTRY,
+        sdkBusinessPartnerAddress.FULL_NAME
+      )
+      // TODO: Add filter filterBusinessPartnerAddress
+      .filter(and(filter));
+    const batchResponsesBPAddress = await bpBatch(queryBuilderBPAddress).execute({
+      destinationName: "APIBusinessHub",
+    });
+    return batchResponsesBPAddress;
+  });
+};

test/API_BUSINESS_PARTNER.http

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+###
+GET http://localhost:4004/odata/v4/business-partner
+###
+GET http://localhost:4004/odata/v4/business-partner/BusinessPartner
+  ?$top=10
+  &$select=BusinessPartner,BusinessPartnerFullName
+###
+GET http://localhost:4004/odata/v4/business-partner/getAllBusinessPartners()