diff --git a/src/test/groovy/org/prebid/server/functional/tests/AliasSpec.groovy b/src/test/groovy/org/prebid/server/functional/tests/AliasSpec.groovy
index d4b8f84c826..3a0133ffe35 100644
--- a/src/test/groovy/org/prebid/server/functional/tests/AliasSpec.groovy
+++ b/src/test/groovy/org/prebid/server/functional/tests/AliasSpec.groovy
@@ -1,24 +1,42 @@
 package org.prebid.server.functional.tests
 
+import org.prebid.server.functional.model.bidder.AppNexus
 import org.prebid.server.functional.model.bidder.Generic
 import org.prebid.server.functional.model.bidder.Openx
 import org.prebid.server.functional.model.request.auction.BidRequest
 import org.prebid.server.functional.service.PrebidServerException
-import org.prebid.server.functional.testcontainers.Dependencies
 import org.prebid.server.functional.util.PBSUtils
+import spock.lang.Shared
 
 import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST
 import static org.prebid.server.functional.model.bidder.BidderName.ALIAS
+import static org.prebid.server.functional.model.bidder.BidderName.APPNEXUS
 import static org.prebid.server.functional.model.bidder.BidderName.BOGUS
 import static org.prebid.server.functional.model.bidder.BidderName.GENERIC
 import static org.prebid.server.functional.model.bidder.BidderName.GENER_X
 import static org.prebid.server.functional.model.bidder.BidderName.OPENX
 import static org.prebid.server.functional.model.bidder.CompressionType.GZIP
+import static org.prebid.server.functional.model.response.auction.ErrorType.PREBID
 import static org.prebid.server.functional.testcontainers.Dependencies.networkServiceContainer
 import static org.prebid.server.functional.util.HttpUtil.CONTENT_ENCODING_HEADER
 
 class AliasSpec extends BaseSpec {
 
+    private static final Map<String, String> ADDITIONAL_BIDDERS_CONFIG = ["adapters.${OPENX.value}.enabled"    : "true",
+                                                                          "adapters.${OPENX.value}.endpoint"   : "$networkServiceContainer.rootUri/${OPENX.value}/auction".toString(),
+                                                                          "adapters.${APPNEXUS.value}.enabled" : "true",
+                                                                          "adapters.${APPNEXUS.value}.endpoint": "$networkServiceContainer.rootUri/${APPNEXUS.value}/auction".toString()]
+    @Shared
+    private static pbsServiceWithAdditionalBidders
+
+    def setupSpec() {
+        pbsServiceWithAdditionalBidders = pbsServiceFactory.getService(ADDITIONAL_BIDDERS_CONFIG + GENERIC_ALIAS_CONFIG)
+    }
+
+    def cleanupSpec() {
+        pbsServiceFactory.removeContainer(ADDITIONAL_BIDDERS_CONFIG + GENERIC_ALIAS_CONFIG)
+    }
+
     def "PBS should be able to take alias from request"() {
         given: "Default bid request with alias"
         def bidRequest = BidRequest.defaultBidRequest.tap {
@@ -142,7 +160,7 @@ class AliasSpec extends BaseSpec {
         }
 
         when: "PBS processes auction request"
-        prebidServerService.sendAuctionRequest(bidRequest)
+        pbsServiceWithAdditionalBidders.sendAuctionRequest(bidRequest)
 
         then: "Bidder request should contain request per-alies"
         def bidderRequests = bidder.getBidderRequests(bidRequest.id)
@@ -209,6 +227,53 @@ class AliasSpec extends BaseSpec {
         pbsServiceFactory.removeContainer(pbsConfig)
     }
 
+    def "PBS should validate request as alias request and without any warnings when required properties in place"() {
+        given: "Default bid request with openx and alias bidder"
+        def bidRequest = BidRequest.defaultBidRequest.tap {
+            imp[0].ext.prebid.bidder.appNexus = AppNexus.default
+            imp[0].ext.prebid.bidder.generic = null
+            ext.prebid.aliases = [(APPNEXUS.value): OPENX]
+        }
+
+        when: "PBS processes auction request"
+        def bidResponse = pbsServiceWithAdditionalBidders.sendAuctionRequest(bidRequest)
+
+        then: "PBS contain http call for specific bidder"
+        def responseDebug = bidResponse.ext.debug
+        assert responseDebug.httpcalls.size() == 1
+        assert responseDebug.httpcalls[APPNEXUS.value]*.uri == ["$networkServiceContainer.rootUri/${APPNEXUS.value}/auction"]
+
+        and: "PBS should not contain any warnings"
+        assert !bidResponse.ext.warnings
+    }
+
+    def "PBS should validate request as alias request and emit proper warnings when validation fails for request"() {
+        given: "Default bid request with openx and alias bidder"
+        def bidRequest = BidRequest.defaultBidRequest.tap {
+            imp[0].ext.prebid.bidder.appNexus = new AppNexus()
+            imp[0].ext.prebid.bidder.generic = null
+            ext.prebid.aliases = [(APPNEXUS.value): OPENX]
+        }
+
+        when: "PBS processes auction request"
+        def bidResponse = pbsServiceWithAdditionalBidders.sendAuctionRequest(bidRequest)
+
+        then: "PBS shouldn't contain http calls"
+        assert !bidResponse.ext.debug.httpcalls
+
+        and: "Bid response should contain warning"
+        assert bidResponse.ext.warnings[PREBID]?.code == [999, 999]
+        assert bidResponse.ext?.warnings[PREBID]*.message ==
+                ["WARNING: request.imp[0].ext.prebid.bidder.${APPNEXUS.value} was dropped with a reason: " +
+                         "request.imp[0].ext.prebid.bidder.${APPNEXUS.value} failed validation.\n" +
+                         "\$.placement_id: is missing but it is required\n" +
+                         "\$.member: is missing but it is required\n" +
+                         "\$.placementId: is missing but it is required\n" +
+                         "\$.inv_code: is missing but it is required\n" +
+                         "\$.invCode: is missing but it is required",
+                 "WARNING: request.imp[0].ext must contain at least one valid bidder"]
+    }
+
     def "PBS should invoke as aliases when alias is unknown and core bidder is specified"() {
         given: "Default bid request with generic and alias bidder"
         def bidRequest = BidRequest.defaultBidRequest.tap {