[MODORDERS-1218/MODORDERS-1219] Fix async issue for change instance c…

…onnection (#1058)

* MODORDERS-1183. Introduce new error code for missed affiliations

* MODORDERS-1218/MODORDERS-1219. Fix async issue with changing instance connection

src/main/java/org/folio/service/orders/lines/update/OrderLinePatchOperationService.java

@@ -131,7 +131,7 @@ private Future<Void> updateInventoryInstanceInformation(PatchOrderLineRequest re
 
     String newInstanceId = request.getReplaceInstanceRef().getNewInstanceId();
     purchaseOrderLineService.getOrderLineById(lineId, requestContext)
-      .map(poLine -> {
+      .compose(poLine -> {
         RequestEntry requestEntry = new RequestEntry(INVENTORY_LOOKUP_ENDPOINTS.get(INSTANCE_RECORDS_BY_ID_ENDPOINT)).withId(newInstanceId);
         return restClient.getAsJsonObject(requestEntry, requestContext)
           .compose(instanceRecord -> updatePoLineWithInstanceRecordInfo(instanceRecord, poLine, requestContext))