Index: trunk/core/units/general/cat_dbitem_export.php
===================================================================
diff -u -r3648 -r3698
--- trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3648)
+++ trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3698)
@@ -170,7 +170,25 @@
 					$object->setError('ExportColumns', 'required');
 					$ret = false;
 				}
+				else {
+					// 1.1. check that all required fields are present in imported file
+					$missing_columns = Array();
+					foreach ($object->Fields as $field_name => $field_options) {
+						if ($object->SkipField($field_name)) continue; 
+						if (getArrayValue($field_options, 'required') && !in_array($field_name, $this->exportOptions['ExportColumns']) ) {	
+							$missing_columns[] = $field_name;
+							$object->setError('ExportColumns', 'required_fields_missing', 'la_error_RequiredColumnsMissing');
+							$ret = false;
+						}
+					}
+					
+					if (!$ret) {
+						$this->Application->Debugger->appendHTML('Missing required for import/export:');
+						$this->Application->Debugger->dumpVars($missing_columns);
+					}
+				}
 				
+				
 				// 2. check, that we have only mixed category field or only separated category fields
 				$category_found['mixed'] = false;
 				$category_found['separated'] = false;
@@ -372,6 +390,8 @@
 			$records_exported = 0;
 			foreach ($records as $record_info) {
 				$this->curItem->SetDBFieldsFromHash($record_info);
+				$this->setCurrentID();
+				$this->curItem->raiseEvent('OnAfterItemLoad', $this->curItem->GetID() );
 				if ($this->hasCustomFields)
 				{
 					$this->loadItemCustomFields();
@@ -415,7 +435,7 @@
 			$field_name = preg_replace('/^Category(Path|[0-9]+)/', '__CATEGORY__Category\\1', $field_name);
 			
 			$valid_fields = $object->getPossibleExportColumns();
-			return isset($valid_fields[$field_name]);
+			return isset($valid_fields[$field_name]) || isset($valid_fields['__VIRTUAL__'.$field_name]);
 		}
 		
 		/**
@@ -471,10 +491,11 @@
 				$this->customValues = Array();
 				$data = $this->readRecord();
 				if ($data) {
+					$this->curItem->Clear();
 					foreach ($data as $field_index => $field_value) {
 						$this->setFieldValue($field_index, $field_value);	
 					}
-					$this->curItem->setID( $this->curItem->GetDBField($this->curItem->IDField) );
+					$this->setCurrentID();
 					$this->processCurrentItem($event);
 				}
 				$bytes_imported = ftell($this->filePointer) - $this->exportOptions['start_from'];
@@ -490,6 +511,11 @@
 			return $this->exportOptions;
 		}
 		
+		function setCurrentID()
+		{
+			$this->curItem->setID( $this->curItem->GetDBField($this->curItem->IDField) );
+		}
+		
 		function setFieldValue($field_index, $value)
 		{
 			$field_name = $this->exportFields[$field_index];
@@ -499,11 +525,15 @@
 				$this->customValues[$field_name] = $value;
 			}
 			elseif ($field_name == 'CategoryPath') {
-				$this->curItem->CategoryPath = explode($this->exportOptions['CategorySeparator'], $value);
+				$this->curItem->CategoryPath = $value ? explode($this->exportOptions['CategorySeparator'], $value) : Array();
 			}
 			elseif (substr($field_name, 0, 8) == 'Category') {
 				$this->curItem->CategoryPath[ (int)substr($field_name, 8) ] = $value;
 			}
+			elseif (substr($field_name, 0, 11) == '__VIRTUAL__') {
+				$field_name = substr($field_name, 11);
+				$this->curItem->SetField($field_name, $value);
+			}			
 			else {
 				$this->curItem->SetField($field_name, $value);
 			}
@@ -517,7 +547,7 @@
 		 */
 		function &getTempItem(&$event)
 		{
-			return $this->Application->recallObject($event->Prefix.'.-tmpitem', $event->Prefix, Array('skip_autoload' => true));
+			return $this->Application->recallObject($event->Prefix.'.-tmpitem'.$event->Special, $event->Prefix, Array('skip_autoload' => true));
 		}
 		
 		/**
@@ -701,6 +731,9 @@
 			{
 				return $this->getCategoryTitle();
 			}
+			elseif (substr($field, 0, 11) == '__VIRTUAL__') {
+				$ret = substr($field, 11);
+			}
 			else
 			{
 				$ret = $field;
@@ -717,15 +750,17 @@
 		 */
 		function getFieldValue($field)
 		{
-			if (substr($field, 0, 10) == '__CUSTOM__')
-			{
+			if (substr($field, 0, 10) == '__CUSTOM__') {
 				$field = substr($field, 10, strlen($field) );
 				$ret = isset($this->customValues[$field]) ? $this->customValues[$field] : '';
 			}
-			elseif (substr($field, 0, 12) == '__CATEGORY__')
-			{
+			elseif (substr($field, 0, 12) == '__CATEGORY__') {
 				return $this->getCategoryPath();
 			}
+			elseif (substr($field, 0, 11) == '__VIRTUAL__') {
+				$field = substr($field, 11);
+				return $this->curItem->GetField($field);
+			}
 			else
 			{
 				$ret = $this->curItem->GetField($field);
@@ -742,16 +777,15 @@
 		 */
 		function getCategoryTitle()
 		{
+			// category path in separated fields
+			$category_count = $this->getMaxCategoryLevel();
 			if ($this->exportOptions['CategoryFormat'] == 1)
 			{
 				// category path in one field
-				return Array('CategoryPath');
+				return $category_count ? Array('CategoryPath') : Array();
 			}
 			else
 			{
-				// category path in separated fields
-				$category_count = $this->getMaxCategoryLevel();
-				
 				$i = 0;
 				$ret = Array();
 				while ($i < $category_count) {
@@ -787,13 +821,13 @@
 					}
 				}
 				
+				$category_count = $this->getMaxCategoryLevel();
 				if ($this->exportOptions['CategoryFormat'] == 1) {
 					// category path in single field
-					$category_path = Array( implode($this->exportOptions['CategorySeparator'], $category_path) );
+					$category_path = $category_count ? Array( implode($this->exportOptions['CategorySeparator'], $category_path) ) : Array();
 				}
 				else {
 					// category path in separated fields
-					$category_count = $this->getMaxCategoryLevel();
 					$levels_used = count($category_path);
 					if ($levels_used < $category_count)
 					{