<status value="active" /> <date value="2025-03-31" /> <description value="Rechnungsdatum" /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="dateTime" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="https://fhir.gkvsv.de/StructureDefinition/GKVSV_EX_ERP_TA7_Rechnungsdatum" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <short value="Rechnungsdatum" /> <definition value="Rechnungsdatum" /> <min value="1" /> <type> <code value="dateTime" /> </type> <constraint> <key value="form-1" /> <severity value="error" /> <human value="Wert muss ein Datum in der Form: YYYY-MM-DD sein." /> <expression value="toString().matches('^([0-9]([0-9]([0-9][1-9]|[1-9]0)|[1-9]00)|[1-9]000)(-(0[1-9]|1[0-2])(-(0[1-9]|[1-2][0-9]|3[0-1]))?)?$')" /> <source value="https://fhir.gkvsv.de/StructureDefinition/GKVSV_EX_ERP_TA7_Rechnungsdatum" /> </constraint> </element> </differential> </StructureDefinition>