diff --git a/procedures/query/applyPOV.sql b/procedures/query/applyPOV.sql
index 28c05c8a2016bd183dfa682368a314f009dbde92..aab2eb19ca26c9393f7e972242a7649f1dd762d5 100644
--- a/procedures/query/applyPOV.sql
+++ b/procedures/query/applyPOV.sql
@@ -32,36 +32,36 @@ POV_LABEL: BEGIN
     DECLARE sIntData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for integer_data*/
     DECLARE sDoubleData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for double_data*/
     DECLARE sDatetimeData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for datetime_data*/
-	DECLARE sNullData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for null_data*/
+    DECLARE sNullData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for null_data*/
     DECLARE sDateData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for date_data*/
     DECLARE sRefData VARCHAR(20000) DEFAULT NULL; /*WHERE CLAUSE for reference_data*/
-	DECLARE aggValue VARCHAR(255) DEFAULT NULL;
+    DECLARE aggValue VARCHAR(255) DEFAULT NULL;
     DECLARE aggValueWhereClause VARCHAR(20000) DEFAULT NULL;
     DECLARE distinctUnits INT DEFAULT 0;
     DECLARE usedStdUnit BIGINT DEFAULT NULL;
-	DECLARE keepTabl VARCHAR(255) DEFAULT NULL;
+    DECLARE keepTabl VARCHAR(255) DEFAULT NULL;
 
     IF o = '->' THEN
-		#-- special case: pure reference property
+        #-- special case: pure reference property
         call applyRefPOV(sourceSet,targetSet, propertiesTable, refIdsTable);
-		LEAVE POV_LABEL;
-	ELSEIF o = '0' THEN
-		#-- special case: property IS NULL
-		#-- generate statement parts
-		SET vText = NULL;
-		SET sTextData = 'SELECT domain_id, entity_id, property_id FROM `null_data` AS subdata';
-    
-	ELSEIF o = '!0' THEN
-		#-- special case: property IS NOT NULL
-		#-- generate statement parts
-		SET vText = NULL;
+        LEAVE POV_LABEL;
+    ELSEIF o = '0' THEN
+        #-- special case: property IS NULL
+        #-- generate statement parts
+        SET vText = NULL;
+        SET sTextData = 'SELECT domain_id, entity_id, property_id FROM `null_data` AS subdata';
+
+    ELSEIF o = '!0' THEN
+        #-- special case: property IS NOT NULL
+        #-- generate statement parts
+        SET vText = NULL;
         SET sTextData = 'SELECT DISTINCT domain_id, entity_id, property_id FROM `text_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `enum_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `integer_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `double_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `date_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `datetime_data` AS subdata WHERE subdata.value IS NOT NULL UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `reference_data` AS subdata WHERE subdata.value IS NOT NULL';
-    
+
     ELSEIF o = "(" or o = "!(" THEN
         SET sTextData = IF(vText IS NULL,' SELECT DISTINCT domain_id, entity_id, property_id FROM `date_data`', IF(vDateTimeDotNotation IS NULL, NULL, CONCAT(' SELECT DISTINCT domain_id, entity_id, property_id FROM `date_data` AS subdata WHERE ',getDateWhereClause(vDateTimeDotNotation,o))));
         SET sDatetimeData = IF(vText IS NULL,' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `datetime_data`', IF(vDateTime IS NULL, NULL, CONCAT(' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `datetime_data` AS subdata WHERE ',getDateTimeWhereClause(vDateTime,o))));
         SET vText = NULL;
-	ELSEIF agg IS NOT NULL THEN
+    ELSEIF agg IS NOT NULL THEN
         #-- find aggregated value (min/max...)
 
         #-- construct where clause
@@ -69,7 +69,7 @@ POV_LABEL: BEGIN
         SET aggValueWhereClause = CONCAT(IF(aggValueWhereClause IS NULL, '', aggValueWhereClause), getAggValueWhereClause(sourceSet, propertiesTable));
 
         #-- construct statement
-        SET @aggValueStmtStr = CONCAT('SELECT ',agg,'(subdata.value), ', agg, '(convert_unit(subdata.unit_sig,subdata.value)), COUNT(DISTINCT standard_unit(subdata.unit_sig)), max(standard_unit(subdata.unit_sig)) INTO @sAggValue, @sAggValueConvert, @distinctUnits, @StdUnitSig FROM (SELECT entity_id, property_id, value, unit_sig FROM `integer_data` UNION SELECT entity_id, property_id, value, unit_sig FROM `double_data`) AS subdata WHERE ', aggValueWhereClause); 
+        SET @aggValueStmtStr = CONCAT('SELECT ',agg,'(subdata.value), ', agg, '(convert_unit(subdata.unit_sig,subdata.value)), COUNT(DISTINCT standard_unit(subdata.unit_sig)), max(standard_unit(subdata.unit_sig)) INTO @sAggValue, @sAggValueConvert, @distinctUnits, @StdUnitSig FROM (SELECT entity_id, property_id, value, unit_sig FROM `integer_data` UNION SELECT entity_id, property_id, value, unit_sig FROM `double_data`) AS subdata WHERE ', aggValueWhereClause);
 
         #-- run statement
         PREPARE stmtAggValueStmt FROM @aggValueStmtStr;
@@ -97,7 +97,7 @@ POV_LABEL: BEGIN
 
         SET vText = NULL;
     ELSE
-		#-- generate statement parts
+        #-- generate statement parts
         SET sTextData = IF(vText IS NULL, 'SELECT DISTINCT domain_id, entity_id, property_id FROM `text_data`', CONCAT('SELECT DISTINCT domain_id, entity_id, property_id FROM `text_data` AS subdata WHERE subdata.value ',o,' ?'));
         SET sEnumData = IF(vText IS NULL, ' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `enum_data`', CONCAT(' UNION SELECT DISTINCT domain_id, entity_id, property_id FROM `enum_data` AS subdata WHERE subdata.value ', o, ' ?'));
         SET sIntData = IF(vText IS NULL, ' UNION ALL SELECT DISTINCT subdata.domain_id, subdata.entity_id, subdata.property_id FROM `integer_data` AS subdata', IF(vInt IS NULL AND vDoubleStdUnit IS NULL, NULL, CONCAT(' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `integer_data` AS subdata WHERE ', getDoubleWhereClause(vInt, unit_sig, vDoubleStdUnit, stdUnit_sig, o))));
@@ -105,18 +105,18 @@ POV_LABEL: BEGIN
         SET sDatetimeData = IF(vText IS NULL,' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `datetime_data`', IF(vDateTime IS NULL, NULL, CONCAT(' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `datetime_data` AS subdata WHERE ',getDateTimeWhereClause(vDateTime,o))));
         SET sDateData = IF(vText IS NULL,' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `date_data`', IF(vDateTimeDotNotation IS NULL, NULL, CONCAT(' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `date_data` AS subdata WHERE ',getDateWhereClause(vDateTimeDotNotation,o))));
         SET sRefData = IF(vText IS NULL, ' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `reference_data`', IF(refIdsTable IS NULL, NULL, CONCAT(' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `reference_data` AS subdata WHERE EXISTS (SELECT 1 FROM `', refIdsTable, '` AS refIdsTable WHERE subdata.value=refIdsTable.id LIMIT 1)')));
-		SET sNullData = IF(vText IS NULL, ' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `null_data`', NULL);
-    
-	END IF;
+        SET sNullData = IF(vText IS NULL, ' UNION ALL SELECT DISTINCT domain_id, entity_id, property_id FROM `null_data`', NULL);
+
+    END IF;
 
     SET data = CONCAT('(',sTextData,
-				IF(sEnumData IS NULL, '', sEnumData),
+                IF(sEnumData IS NULL, '', sEnumData),
                 IF(sDoubleData IS NULL, '', sDoubleData),
                 IF(sIntData IS NULL, '', sIntData),
                 IF(sDatetimeData IS NULL, '', sDatetimeData),
                 IF(sDateData IS NULL, '', sDateData),
                 IF(sRefData IS NULL, '', sRefData),
-				IF(sNullData IS NULL, '', sNullData),
+                IF(sNullData IS NULL, '', sNullData),
                 ')'
             );
 
@@ -124,20 +124,20 @@ POV_LABEL: BEGIN
     call createTmpTable(keepTabl);
 
     #-- generate statement from statement parts
-	SET @stmtPOVkeepTblStr = CONCAT("INSERT IGNORE INTO `", keepTabl, "` (id) SELECT DISTINCT entity_id AS id FROM ", data, " as data", IF(propertiesTable IS NULL, '', CONCAT(' WHERE EXISTS (Select 1 from `', propertiesTable, '` AS prop WHERE prop.id = data.property_id AND (prop.id2=data.entity_id OR prop.id2=0))')));
-	
-	SET @stmtPOVStr = CONCAT(
+    SET @stmtPOVkeepTblStr = CONCAT("INSERT IGNORE INTO `", keepTabl, "` (id) SELECT DISTINCT entity_id AS id FROM ", data, " as data", IF(propertiesTable IS NULL, '', CONCAT(' WHERE EXISTS (Select 1 from `', propertiesTable, '` AS prop WHERE prop.id = data.property_id AND (prop.id2=data.entity_id OR prop.id2=0))')));
+
+    SET @stmtPOVStr = CONCAT(
             IF(targetSet IS NULL,
-                CONCAT('DELETE FROM `',sourceSet,'` WHERE NOT EXISTS (SELECT 1 FROM `'), 
+                CONCAT('DELETE FROM `',sourceSet,'` WHERE NOT EXISTS (SELECT 1 FROM `'),
                 CONCAT('INSERT IGNORE INTO `',targetSet,'` (id) SELECT id FROM `',sourceSet,'` WHERE EXISTS (SELECT 1 FROM `')),
-			keepTabl,
+            keepTabl,
             '` AS data WHERE data.id=`', sourceSet, '`.`id` LIMIT 1)'
-        ); 
+        );
 
 
     #-- prepare and execute
     PREPARE stmt3 FROM @stmtPOVStr;
-	PREPARE stmtPOVkeepTbl FROM @stmtPOVkeepTblStr;
+    PREPARE stmtPOVkeepTbl FROM @stmtPOVkeepTblStr;
     IF vText IS NULL THEN
         EXECUTE stmtPOVkeepTbl;
     ELSE
@@ -145,8 +145,8 @@ POV_LABEL: BEGIN
         EXECUTE stmtPOVkeepTbl USING @vText, @vText;
     END IF;
     EXECUTE stmt3;
-	DEALLOCATE PREPARE stmt3;
-	DEALLOCATE PREPARE stmtPOVkeepTbl;
+    DEALLOCATE PREPARE stmt3;
+    DEALLOCATE PREPARE stmtPOVkeepTbl;
 
     SELECT @stmtPOVkeepTblStr as applyPOVStmt1, @stmtPOVStr as applyPOVStmt2, keepTabl as applyPOVIntermediateResultSet;
 
diff --git a/procedures/query/getDoubleWhereClause.sql b/procedures/query/getDoubleWhereClause.sql
index 0bf443dcf39850281e80842f280a96f71f73f4bc..a9e730768a3d09f62f7f8ebaed3a136f920dff1e 100644
--- a/procedures/query/getDoubleWhereClause.sql
+++ b/procedures/query/getDoubleWhereClause.sql
@@ -27,11 +27,11 @@ DELIMITER //
 CREATE FUNCTION db_2_0.getDoubleWhereClause(value DOUBLE, unit_sig BIGINT, valueStdUnit DECIMAL(65,30), stdUnit_sig BIGINT, o CHAR(4)) RETURNS VARCHAR(20000) DETERMINISTIC
 BEGIN
     RETURN IF(unit_sig IS NULL AND value IS NOT NULL, 
-        CONCAT('subdata.value', o, '\'', value, '\''), #-- without unit but value must not be NULL
+        CONCAT('subdata.value ', o, ' \'', value, '\''), #-- without unit but value must not be NULL
         CONCAT(
             IF(value IS NULL, '', #-- value is NULL, but valueStdUnit might not be NULL  
-                CONCAT('(subdata.unit_sig=', unit_sig, ' AND subdata.value', o, '\'', value, '\') OR ')), 
-        	IF(unit_sig = stdUnit_sig,'',CONCAT('(subdata.unit_sig=', stdUnit_sig,' AND subdata.value', o, '\'', valueStdUnit, '\') OR ')),'(standard_unit(subdata.unit_sig)=', stdUnit_sig,' AND convert_unit(subdata.unit_sig,subdata.value)', o, valueStdUnit, ')')); #-- with unit and non-null valueStdUnit
+                CONCAT('(subdata.unit_sig=', unit_sig, ' AND subdata.value ', o, ' \'', value, '\') OR ')), 
+        	IF(unit_sig = stdUnit_sig,'',CONCAT('(subdata.unit_sig=', stdUnit_sig,' AND subdata.value ', o, ' \'', valueStdUnit, '\') OR ')),'(standard_unit(subdata.unit_sig)=', stdUnit_sig,' AND convert_unit(subdata.unit_sig,subdata.value) ', o, ' ', valueStdUnit, ')')); #-- with unit and non-null valueStdUnit
 END;
 //
 DELIMITER ;