diff --git a/application/controllers/api/frontend/v1/issues/IssueChecker.php b/application/controllers/api/frontend/v1/issues/IssueChecker.php
index f4ffb4929..efd457ace 100644
--- a/application/controllers/api/frontend/v1/issues/IssueChecker.php
+++ b/application/controllers/api/frontend/v1/issues/IssueChecker.php
@@ -8,7 +8,7 @@ class IssueChecker extends FHCAPI_Controller
 	protected $person_id;
 	protected $_extensionName = null;
 	protected $_fehlercodes = [];
-	//protected $_app = null; TODO possible to check for all fehler of app?
+	protected $_apps = [];
 
 	protected $errors = [];
 	protected $infos = [];
@@ -33,31 +33,53 @@ class IssueChecker extends FHCAPI_Controller
 		$this->load->model('system/Fehler_model', 'FehlerModel');
 		$this->load->model('person/Person_model', 'PersonModel');
 
-		// get fehler kurzbz from fehlercodes
-		$this->FehlerModel->addSelect('fehler_kurzbz');
-		if (!isEmptyArray($this->_fehlercodes)) $this->FehlerModel->db->where_in('tbl_fehler.fehlercode', $this->_fehlercodes);
-		$fehlerKurzbzRes = $this->FehlerModel->load();
+		$producerArgs = [];
+		$resolverArgs = [];
 
-		if (isError($fehlerKurzbzRes)) $this->terminateWithError(getError($fehlerKurzbzRes), self::ERROR_TYPE_GENERAL);
+		// get fehler kurzbz from fehlercodes, if fehlercodes provided
+		if (!isEmptyArray($this->_fehlercodes))
+		{
+			$this->FehlerModel->addSelect('fehlercode, fehler_kurzbz');
+			$this->FehlerModel->db->where_in('tbl_fehler.fehlercode', $this->_fehlercodes);
+			$fehlerKurzbzRes = $this->FehlerModel->load();
 
-		$fehlerKurzbz = hasData($fehlerKurzbzRes) ? array_column(getData($fehlerKurzbzRes), 'fehler_kurzbz') : [];
+			if (isError($fehlerKurzbzRes)) $this->terminateWithError(getError($fehlerKurzbzRes), self::ERROR_TYPE_GENERAL);
+			if (hasData($fehlerKurzbzRes))
+			{
+				$producerArgs['fehlerKurzbz'] = array_column(getData($fehlerKurzbzRes), 'fehler_kurzbz');
+				$resolverArgs['fehlercode'] = array_column(getData($fehlerKurzbzRes), 'fehlercode');
+			}
+		}
+		elseif (!isEmptyArray($this->_apps)) // if apps are provided
+		{
+			// get fehlercodes for the apps
+			$fehlerRes = $this->FehlerModel->getByApps($this->_apps);
+			if (hasData($fehlerRes)) $this->_fehlercodes = array_column(getData($fehlerRes), 'fehlercode');
+
+			$producerArgs['apps'] = $this->_apps;
+			$resolverArgs['apps'] = $this->_apps;
+		}
 
 		// load producer and checker libraries with fehler kurbz and fehlercode list
 		$this->load->library(
 			'issues/PlausicheckProducerLib',
-			array(
-				'fehlerKurzbz' => $fehlerKurzbz
-			),
+			$producerArgs,
 			'PlausicheckProducerLib'
 		);
 
 		$this->load->library(
 			'issues/PlausicheckResolverLib',
-			array(
-				'fehlercodes' => $this->_fehlercodes
-			),
+			$resolverArgs,
 			'PlausicheckResolverLib'
 		);
+
+		$this->load->library('PhrasesLib');
+
+		$this->loadPhrases(
+			array(
+				'ui'
+			)
+		);
 	}
 
 	public function checkPerson()
diff --git a/application/controllers/api/frontend/v1/issues/Issues.php b/application/controllers/api/frontend/v1/issues/Issues.php
index 79ce91db2..89a166ce3 100644
--- a/application/controllers/api/frontend/v1/issues/Issues.php
+++ b/application/controllers/api/frontend/v1/issues/Issues.php
@@ -6,11 +6,9 @@ defined('BASEPATH') || exit('No direct script access allowed');
 class Issues extends FHCAPI_Controller
 {
 	const DEFAULT_PERMISSION = 'system/issues_verwalten:r';
-	// code igniter 
-	protected $CI;
 
 	public function __construct() {
-		
+
 		parent::__construct(
 			array(
 				'getOpenIssuesByProperties' => Self::DEFAULT_PERMISSION,
@@ -26,9 +24,6 @@ class Issues extends FHCAPI_Controller
 		$this->load->model('system/Fehler_model','FehlerModel');
 		$this->load->model('system/Issue_model', 'IssueModel');
 		$this->load->model('person/Benutzer_model', 'BenutzerModel');
-		
-		// get CI for transaction management
-		$this->CI = &get_instance();
 	}
 
 	public function getOpenIssuesByProperties()
@@ -46,8 +41,6 @@ class Issues extends FHCAPI_Controller
 		if (isset($behebung_parameter) && !is_array($behebung_parameter))
 			$this->terminateWithError('Behebung parameter invalid');
 
-			$this->addMeta("vorher", $hauptzustaendig);
-
 		$issueRes = $this->IssueModel->getOpenIssuesByProperties(
 			$person_id,
 			$oe_kurzbz,
@@ -67,39 +60,39 @@ class Issues extends FHCAPI_Controller
 
 	public function getPersonenMitOffenenIssues()
 	{
-		
+
 		$sql = <<<EOSQL
 SELECT
 
 		person_id, uid, vorname, nachname, count(*) AS openissues ,
-		(select count(*) anz_aktiv 
-		 from hr.tbl_dienstverhaeltnis dv 
-		 where dv.mitarbeiter_uid=uid and dv.von<=now() and 
+		(select count(*) anz_aktiv
+		 from hr.tbl_dienstverhaeltnis dv
+		 where dv.mitarbeiter_uid=uid and dv.von<=now() and
 		       (dv.bis is null OR dv.bis>=now())
 		) aktiv
-FROM 
-		system.tbl_issue 
-JOIN 
-		system.tbl_fehler USING (fehlercode) 
-JOIN 
-		public.tbl_person USING (person_id) 
-JOIN 
-		public.tbl_benutzer USING (person_id) 
-JOIN 
-		public.tbl_mitarbeiter ON uid = mitarbeiter_uid                         
-WHERE 
-		app = 'personalverwaltung' AND verarbeitetamum IS NULL 
-GROUP BY 
-		person_id, uid, vorname, nachname 
-HAVING 
-		count(*) > 0 
-ORDER BY 
+FROM
+		system.tbl_issue
+JOIN
+		system.tbl_fehler USING (fehlercode)
+JOIN
+		public.tbl_person USING (person_id)
+JOIN
+		public.tbl_benutzer USING (person_id)
+JOIN
+		public.tbl_mitarbeiter ON uid = mitarbeiter_uid
+WHERE
+		app = 'personalverwaltung' AND verarbeitetamum IS NULL
+GROUP BY
+		person_id, uid, vorname, nachname
+HAVING
+		count(*) > 0
+ORDER BY
 		count(*) DESC;
-			
+
 EOSQL;
-		
+
 		$personenmitissues = $this->IssueModel->execReadOnlyQuery($sql);
-		if( hasData($personenmitissues) ) 
+		if( hasData($personenmitissues) )
 		{
 			$this->terminateWithSuccess(getData($personenmitissues));
 		}
diff --git a/application/libraries/IssuesLib.php b/application/libraries/IssuesLib.php
index c9cbf75d6..8e505bd83 100644
--- a/application/libraries/IssuesLib.php
+++ b/application/libraries/IssuesLib.php
@@ -243,7 +243,7 @@ class IssuesLib
 		$inhalt_extern = null
 	) {
 		if (isEmptyString($person_id) && isEmptyString($oe_kurzbz))
-			return error("Person_id or oe_kurzbz must be set.");
+			return error("Person_id or oe_kurzbz must be set, fehlercode: $fehlercode");
 
 		// get fehlertextVorlage and replace it with params
 		$fehlerRes = $this->_ci->FehlerModel->loadWhere(['fehlercode' => $fehlercode]);
@@ -256,7 +256,7 @@ class IssuesLib
 			if (!isEmptyArray($fehlertext_params))
 			{
 				if (count($fehlertext_params) != substr_count($fehlertextVorlage, '%s'))
-					return error('Wrong number of parameters for Fehlertext, fehler_kurzbz ' . $fehlercode);
+					return error('Wrong number of parameters for Fehlertext, fehlercode ' . $fehlercode);
 
 				$fehlertext = vsprintf($fehlertextVorlage, $fehlertext_params);
 			}
diff --git a/application/libraries/issues/PlausicheckProducerLib.php b/application/libraries/issues/PlausicheckProducerLib.php
index 36bc19eb3..bcab8ac56 100644
--- a/application/libraries/issues/PlausicheckProducerLib.php
+++ b/application/libraries/issues/PlausicheckProducerLib.php
@@ -61,14 +61,10 @@ class PlausicheckProducerLib
 		}
 		else
 		{
-			$this->_ci->FehlerModel->addSelect('fehler_kurzbz');
-			if (!isEmptyArray($this->_apps)) $this->_ci->FehlerModel->db->where_in('app', $this->_apps);
-			$fehlerRes = $this->_ci->FehlerModel->load();
+			// get fehler by apps
+			$fehlerRes = $this->_ci->FehlerModel->getByApps($this->_apps);
 
-			if (hasData($fehlerRes))
-			{
-				$this->_fehlerKurzbz = array_column(getData($fehlerRes), 'fehler_kurzbz');
-			}
+			if (hasData($fehlerRes)) $this->_fehlerKurzbz = array_column(getData($fehlerRes), 'fehler_kurzbz');
 		}
 
 		// get producer file paths for the fehler
@@ -151,10 +147,10 @@ class PlausicheckProducerLib
 		$mappingFehlerKurbz = array_keys($this->_fehlerLibMappings);
 
 		// check if all issues to produce could be found in database
-		$notFoundFehlerKurzbz = array_diff($this->_fehlerKurzbz, $mappingFehlerKurbz);
+		//~ $notFoundFehlerKurzbz = array_diff($this->_fehlerKurzbz, $mappingFehlerKurbz);
 
-		if (!isEmptyArray($notFoundFehlerKurzbz))
-			$result->errors[] = error('Fehler to produce not defined in config: '.implode(', ', $notFoundFehlerKurzbz));
+		//~ if (!isEmptyArray($notFoundFehlerKurzbz))
+			//~ $result->errors[] = error('Fehler to produce not defined in config: '.implode(', ', $notFoundFehlerKurzbz));
 
 		foreach ($mappingFehlerKurbz as $fehler_kurzbz)
 		{
diff --git a/application/libraries/issues/PlausicheckResolverLib.php b/application/libraries/issues/PlausicheckResolverLib.php
index 0f58deda0..e4cdcc23f 100644
--- a/application/libraries/issues/PlausicheckResolverLib.php
+++ b/application/libraries/issues/PlausicheckResolverLib.php
@@ -20,18 +20,36 @@ class PlausicheckResolverLib
 	private $_ci; // ci instance
 	private $_extensionName; // name of extension
 	private $_fehlercodes = []; // name of extension
+	private $_apps = []; // apps for which issues should be resolved
 	private $_codeLibMappings = []; // mappings for issues which explicitly defined resolver
 	private $_defaultIssueParams = ['issue_id' => 'issue_id', 'issue_person_id' => 'person_id', 'issue_oe_kurzbz' => 'oe_kurzbz'];
 
 	public function __construct($params = null)
 	{
+		// set application(s))
+		if (isset($params['apps']))
+		{
+			if (is_string($params['apps'])) $params['apps'] = [$params['apps']];
+			if (is_array($params['apps'])) $this->_apps = $params['apps'];
+		}
+
+		$this->_ci =& get_instance(); // get ci instance
+
 		// get all fehler to be produced (by kurzbz array or app)
 		if (isset($params['fehlercodes']) && !isEmptyArray($params['fehlercodes']))
 		{
 			$this->_fehlercodes = $params['fehlercodes'];
 		}
+		elseif (isset($params['apps']) && !isEmptyArray($params['apps']))
+		{
+			$this->_ci->load->model('system/Fehler_model', 'FehlerModel');
+			$fehlerRes = $this->_ci->FehlerModel->getByApps($this->_apps);
 
-		$this->_ci =& get_instance(); // get ci instance
+			if (hasData($fehlerRes))
+			{
+				$this->_fehlercodes = array_column(getData($fehlerRes), 'fehlercode');
+			}
+		}
 
 		$this->_ci->load->library('IssuesLib');
 		$this->_ci->load->library('ExtensionsLib');
@@ -144,11 +162,11 @@ class PlausicheckResolverLib
 		$result->infos = [];
 
 		// check if all issues to resolve could be found in database
-		$mappingFehlerCodes = array_keys($this->_codeLibMappings);
-		$notFoundFehlerCodes = array_diff($this->_fehlercodes, $mappingFehlerCodes);
+		//~ $mappingFehlerCodes = array_keys($this->_codeLibMappings);
+		//~ $notFoundFehlerCodes = array_diff($this->_fehlercodes, $mappingFehlerCodes);
 
-		if (!isEmptyArray($notFoundFehlerCodes))
-			$result->errors[] = error('Fehler to resolve not defined in config: '.implode(', ', $notFoundFehlerCodes));
+		//~ if (!isEmptyArray($notFoundFehlerCodes))
+			//~ $result->errors[] = error('Fehler to resolve not defined in config: '.implode(', ', $notFoundFehlerCodes));
 
 		foreach ($openIssues as $issue)
 		{