diff --git a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/filterentities/FilterEntities.java b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/filterentities/FilterEntities.java
index 3cdb299..2840dde 100644
--- a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/filterentities/FilterEntities.java
+++ b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/filterentities/FilterEntities.java
@@ -3,12 +3,17 @@ package eu.dnetlib.dhp.oa.graph.dump.filterentities;
 
 import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;
 
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
 import java.io.Serializable;
+import java.util.Arrays;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.function.FilterFunction;
 import org.apache.spark.api.java.function.FlatMapFunction;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.*;
@@ -69,7 +74,7 @@ public class FilterEntities implements Serializable {
 	}
 
 	private static <R extends Result> void filterEntities(SparkSession spark, String inputPath, String filterPath,
-		String workingDir) {
+                                                   String workingDir) {
 		ModelSupport.entityTypes.keySet().forEach(e -> {
 			if (ModelSupport.isResult(e)) {
 				Class<R> resultClazz = ModelSupport.entityTypes.get(e);
@@ -81,6 +86,8 @@ public class FilterEntities implements Serializable {
 
 				result
 					.join(filterIds, result.col("id").equalTo(filterIds.col("id")), "leftsemi")
+						.as(Encoders.bean(resultClazz))
+						.filter((FilterFunction<R>) FilterEntities::verifyLot1Constraints)
 					.write()
 					.mode(SaveMode.Overwrite)
 					.option("compression", "gzip")
@@ -90,4 +97,53 @@ public class FilterEntities implements Serializable {
 
 		});
 	}
+
+	private static <R extends eu.dnetlib.dhp.schema.oaf.Result> boolean verifyLot1Constraints(R r) {
+		if (r.getInstance().stream().anyMatch(i ->
+				Arrays.asList("10|re3data_____::c4b2081b224be6b3e79d0e5e5556f631","10|openaire____::dbfd07503aaa1ed31beed7dec942f3f4").contains(i.getHostedby().getKey())))
+			return true;
+		if (!Optional.ofNullable(r.getTitle()).isPresent() ||
+				r.getTitle().isEmpty() ||
+				!Optional.ofNullable(r.getDateofacceptance()).isPresent() ||
+				r.getDateofacceptance().getValue().isEmpty() ||
+				!isValidFormat(r.getDateofacceptance().getValue()))
+			return false;
+
+		switch(r.getResulttype().getClassname()){
+			case "publication":
+				return
+						r.getInstance().stream().anyMatch(i -> Arrays.asList("Book", "Article", "Journal", "Data Paper", "Software Paper", "Preprint", "Part of book or chapter of book",
+								"Thesis", "Master thesis", "Bachelor thesis", "Doctoral thesis",  "Conference object", "Research", "Other literature type").contains(i.getInstancetype().getClassid()))
+						&&
+						Optional.ofNullable(r.getAuthor()).isPresent() && !r.getAuthor().isEmpty()
+						&& Optional.ofNullable(r.getDescription()).isPresent() && !r.getDescription().isEmpty();
+
+
+			case "dataset":
+				return
+						Optional.ofNullable(r.getAuthor()).isPresent() && !r.getAuthor().isEmpty();
+
+
+			case "software":
+				return true;
+
+			case "otherresearchproduct":
+				return true;
+
+		}
+		return false;
+	}
+
+	public static boolean isValidFormat(String value) {
+
+		try {
+			DateFormat df = new SimpleDateFormat(DATE_FORMAT);
+			df.setLenient(false);
+			df.parse(value);
+			return true;
+		} catch (ParseException e) {
+			return false;
+		}
+
+	}
 }