diff --git a/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php b/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
index 4405952a4..05d7c66c2 100644
--- a/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
+++ b/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
@@ -75,8 +75,9 @@ class BetriebsmittelP extends FHCAPI_Controller
 			'required' => $this->p->t('ui', 'error_fieldRequired')
 		]);
 
-		$this->form_validation->set_rules('kaution', 'Kaution', 'numeric|less_than_equal_to[9999.99]', [
-			'numeric' => $this->p->t('ui', 'error_fieldNotNumeric')
+		$this->form_validation->set_rules('kaution', 'Kaution', 'callback_valid_number|callback_not_less_than_equal', [
+			'valid_number' => $this->p->t('ui', 'error_fieldNoValidNumber'),
+			'not_less_than_equal' => $this->p->t('ui', 'error_fieldLessThan1000'),
 		]);
 
 		$this->form_validation->set_rules('ausgegebenam', 'Ausgegeben am', 'required|is_valid_date', [
@@ -159,10 +160,6 @@ class BetriebsmittelP extends FHCAPI_Controller
 			'uid_in_person' => $this->p->t('person', 'error_uidNotInPerson')
 		]);
 
-		$this->form_validation->set_rules('kaution', 'Kaution', 'numeric', [
-			'numeric' => $this->p->t('ui', 'error_fieldNotNumeric', ['field' => 'Kaution'])
-		]);
-
 		$this->validateNewOrUpdate();
 
 		$betriebsmitteltyp = $this->input->post('betriebsmitteltyp');
@@ -172,6 +169,7 @@ class BetriebsmittelP extends FHCAPI_Controller
 		$betriebsmittel_id = $this->input->post('betriebsmittel_id');
 		$anmerkung = $this->input->post('anmerkung');
 		$kaution = $this->input->post('kaution');
+		if($kaution) $kaution = str_replace(',', '.', $kaution);
 		$ausgegebenam = $this->input->post('ausgegebenam');
 		$retouram = $this->input->post('retouram');
 		$uid = $this->input->post('uid');
@@ -246,10 +244,6 @@ class BetriebsmittelP extends FHCAPI_Controller
 
 	public function updateBetriebsmittel($betriebsmittelperson_id)
 	{
-		$this->form_validation->set_rules('kaution', 'Kaution', 'numeric', [
-			'numeric' => $this->p->t('ui', 'error_fieldNotNumeric', ['field' => 'Kaution'])
-		]);
-
 		$this->validateNewOrUpdate();
 
 		$betriebsmitteltyp = $this->input->post('betriebsmitteltyp');
@@ -259,6 +253,7 @@ class BetriebsmittelP extends FHCAPI_Controller
 		$betriebsmittel_id = $this->input->post('betriebsmittel_id');
 		$anmerkung = $this->input->post('anmerkung');
 		$kaution = $this->input->post('kaution');
+		if($kaution) $kaution = str_replace(',', '.', $kaution);
 		$ausgegebenam = $this->input->post('ausgegebenam');
 		$retouram = $this->input->post('retouram');
 
@@ -391,6 +386,26 @@ class BetriebsmittelP extends FHCAPI_Controller
 
 		$this->terminateWithSuccess($data);
 	}
+
+	public function valid_number($number)
+	{
+		if(is_null($number)) return true;
+		$number = str_replace(',', '.', $number);
+		if (!is_numeric($number))
+		{
+			return false;
+		}
+		return true;
+	}
+
+	public function not_less_than_equal($number)
+	{
+		$number = str_replace(',', '.', $number);
+		if ($number < 1000)
+			return true;
+		return false;
+
+	}
 }
 
 
diff --git a/public/js/components/Betriebsmittel/Betriebsmittel.js b/public/js/components/Betriebsmittel/Betriebsmittel.js
index 502ede059..6d976a1fa 100644
--- a/public/js/components/Betriebsmittel/Betriebsmittel.js
+++ b/public/js/components/Betriebsmittel/Betriebsmittel.js
@@ -290,12 +290,6 @@ export default {
 			this.formData.anmerkung = null;
 			this.formData.beschreibung = null;
 			this.statusNew = true;
-		},
-		//helper function: workaround to trigger validation if input is not a number
-		normalizeKaution() {
-			if (this.formData.kaution === null || this.formData.kaution === '') {
-				this.formData.kaution = 'xxx'
-			}
 		}
 	},
 	created() {
@@ -406,10 +400,9 @@ export default {
 				
 				<div class="row mb-3">
 					<form-input
-						type="number"
+						type="text"
 						:label="$p.t('infocenter/kaution')"
 						name="kaution"
-						@blur="normalizeKaution"
 						v-model="formData.kaution"
 						>
 					</form-input>
diff --git a/system/phrasesupdate.php b/system/phrasesupdate.php
index 5ca44148d..b3af0d059 100644
--- a/system/phrasesupdate.php
+++ b/system/phrasesupdate.php
@@ -44600,12 +44600,12 @@ and represent the current state of research on the topic. The prescribed citatio
 	array(
 		'app' => 'core',
 		'category' => 'ui',
-		'phrase' => 'error_fieldLessThan10000',
+		'phrase' => 'error_fieldLessThan1000',
 		'insertvon' => 'system',
 		'phrases' => array(
 			array(
 				'sprache' => 'German',
-				'text' => 'Das Eingabefeld {field} darf maximal 4-stellig sein.',
+				'text' => 'Das Eingabefeld {field} muss kleiner als 1000 sein.',
 				'description' => '',
 				'insertvon' => 'system'
 			),
@@ -44617,6 +44617,26 @@ and represent the current state of research on the topic. The prescribed citatio
 			)
 		)
 	),
+	array(
+		'app' => 'core',
+		'category' => 'ui',
+		'phrase' => 'error_fieldNoValidNumber',
+		'insertvon' => 'system',
+		'phrases' => array(
+			array(
+				'sprache' => 'German',
+				'text' => 'Das Eingabefeld {field} muss eine gültige Zahl sein',
+				'description' => '',
+				'insertvon' => 'system'
+			),
+			array(
+				'sprache' => 'English',
+				'text' => 'The Input Field {field} has to be a valid number',
+				'description' => '',
+				'insertvon' => 'system'
+			)
+		)
+	),
 	// FHC-4 Finetuning END
 );