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src/components/manifest/ManifestForm.jsx

@@ -1148,6 +1148,13 @@ class ManifestForm extends PureComponent {
     if (this.state.saving) return false;
     if (mode === 'edit' && docId == null) return false;
 
+    if (cfg.kind === 'order' && (this.state.partyId == null || this.state.partyId === '')) {
+      this.setState({ partyError: true });
+      notifyErrorMessage('Für eine Bestellung ist ein Kunde erforderlich.');
+      this.headerRef.current?.focusPartyInput?.();
+      return false;
+    }
+
     const isEdit = mode === 'edit';
     let body;
     try {

src/components/manifest/ManifestHeader.jsx

@@ -274,9 +274,11 @@ class ManifestHeader extends PureComponent {
     const hasArticles = this.hasArticles();
     const isEdit = docId != null;
     const hasAttachments = Array.isArray(attachments) && attachments.length > 0;
-    const canSave = isEdit
-      ? Boolean(isDirty)
-      : Boolean(hasArticles || hasAttachments);
+    const hasParty = partyId != null && partyId !== '';
+    const partyValid = kind !== 'order' || hasParty;
+    const canSave =
+      partyValid &&
+      (isEdit ? Boolean(isDirty) : Boolean(hasArticles || hasAttachments));
 
     // Delivery: number is server-allocated/read-only; the caller reference
     // lives in the editable externalNumber field.
@@ -375,8 +377,8 @@ class ManifestHeader extends PureComponent {
                   {...params}
                   inputRef={this.partyInputRef}
                   label={dirtyFields?.partyId ? `${partyLabel} *` : partyLabel}
+                  required={kind === 'order'}
                   error={isPartyEmpty}
-                  helperText={Boolean(partyError) && isPartyEmpty ? 'Kunde für Bestellung erforderlich' : undefined}
                   onKeyDown={this.handlePartyKeyDown}
                   slotProps={{
                     ...params.slotProps,

src/components/manifest/manifestConfig.js

@@ -527,6 +527,8 @@ export async function buildManifestBody(
     if (!Number.isNaN(pid)) {
       body[partyField] = pid;
     }
+  } else if (kind === 'order') {
+    throw new Error('Für eine Bestellung ist ein Kunde erforderlich.');
   } else if (isEdit) {
     body[partyField] = null;
   }