diff --git a/Resources/fsh-generated/resources/StructureDefinition-GEM-ERP-PR-MedicationDispense.json b/Resources/fsh-generated/resources/StructureDefinition-GEM-ERP-PR-MedicationDispense.json
index 7beaf4eb..4828d816 100644
--- a/Resources/fsh-generated/resources/StructureDefinition-GEM-ERP-PR-MedicationDispense.json
+++ b/Resources/fsh-generated/resources/StructureDefinition-GEM-ERP-PR-MedicationDispense.json
@@ -90,6 +90,15 @@
       {
         "id": "MedicationDispense.whenPrepared",
         "path": "MedicationDispense.whenPrepared",
+        "constraint": [
+          {
+            "key": "workflow-abgabeDatumsFormat",
+            "human": "Wert muss ein Datum in der Form: YYYY-MM-DD sein.",
+            "source": "https://gematik.de/fhir/erp/StructureDefinition/GEM_ERP_PR_MedicationDispense",
+            "severity": "error",
+            "expression": "toString().length()=10"
+          }
+        ],
         "mustSupport": false
       },
       {
diff --git a/Resources/input/fsh/profiles/GEM_ERP_PR_MedicationDispense.fsh b/Resources/input/fsh/profiles/GEM_ERP_PR_MedicationDispense.fsh
index 7a93eb25..034a834c 100644
--- a/Resources/input/fsh/profiles/GEM_ERP_PR_MedicationDispense.fsh
+++ b/Resources/input/fsh/profiles/GEM_ERP_PR_MedicationDispense.fsh
@@ -21,6 +21,7 @@ Description: "Handles information about the redeem of the prescription and the s
 * performer.actor.identifier 1..
 * performer.actor.identifier only IdentifierTelematikId
 * whenPrepared ^mustSupport = false
+* whenPrepared obeys workflow-abgabeDatumsFormat
 * whenHandedOver 1..
 * whenHandedOver obeys workflow-abgabeDatumsFormat
 * dosageInstruction MS