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src/components/manifest/OrderShipmentDialog.jsx

@@ -40,6 +40,24 @@ function computeShippedBySku(shipments) {
   return map;
 }
 
+// MARK: helper to determine next shipment number preview
+export function getNextShipmentNumber(orderNumber, shipments = []) {
+  if (!orderNumber) return '–';
+  let maxIdx = 0;
+  for (const s of shipments || []) {
+    const num = String(s.number ?? '').trim();
+    const match = num.match(/-L-(\d+)$/i) || num.match(/-(\d+)$/);
+    if (match) {
+      const parsed = parseInt(match[1], 10);
+      if (!Number.isNaN(parsed) && parsed > maxIdx) {
+        maxIdx = parsed;
+      }
+    }
+  }
+  const nextIdx = maxIdx > 0 ? maxIdx + 1 : ((shipments?.length || 0) + 1);
+  return `${orderNumber}-L-${nextIdx}`;
+}
+
 /**
  * Dialog for selecting items and quantities to create a shipment from a sales order.
  * Calls POST /api/order/:id/shipment.
@@ -228,6 +246,7 @@ export default class OrderShipmentDialog extends PureComponent {
   render() {
     const { open, onClose, orderNumber, lines = [], shipments = [] } = this.props;
     const { date, externalNumber, lineAmounts, selectedSkus, saving, error } = this.state;
+    const nextShipmentNumber = getNextShipmentNumber(orderNumber, shipments);
 
     const shippedBySku = computeShippedBySku(shipments);
     const activeLines = lines.filter((l) => Boolean(l.sku));
@@ -293,7 +312,7 @@ export default class OrderShipmentDialog extends PureComponent {
             </Alert>
           )}
 
-          {/* Header controls: date and external reference */}
+          {/* Header controls: date, preview shipment number, and external reference */}
           <Stack direction={{ xs: 'column', sm: 'row' }} spacing={2} sx={{ mb: 2.5 }}>
             <TextField
               size="small"
@@ -303,7 +322,19 @@ export default class OrderShipmentDialog extends PureComponent {
               disabled={saving}
               onChange={(e) => this.setState({ date: e.target.value })}
               slotProps={{ inputLabel: { shrink: true } }}
-              sx={{ minWidth: 170 }}
+              sx={{ minWidth: 160 }}
+            />
+            <TextField
+              size="small"
+              label="Lieferschein-Nr."
+              value={nextShipmentNumber}
+              disabled
+              slotProps={{
+                input: {
+                  readOnly: true,
+                },
+              }}
+              sx={{ minWidth: 190 }}
             />
             <TextField
               size="small"

src/components/manifest/ShipmentList.jsx

@@ -31,6 +31,7 @@ import { notifyError } from '../../utils/notify';
 import { getMaxDocumentNumber } from '../../utils/documentNumber';
 import withNavigate from '../withNavigate';
 import ShipmentDetailDialog from './ShipmentDetailDialog';
+import { getNextShipmentNumber } from './OrderShipmentDialog';
 import {
   formatDate,
   loadParties,
@@ -206,8 +207,18 @@ class NewShipmentModal extends PureComponent {
                 value={date}
                 onChange={(e) => this.setState({ date: e.target.value })}
                 InputLabelProps={{ shrink: true }}
-                sx={{ width: 180 }}
+                sx={{ width: 170 }}
               />
+              {currentOrder ? (
+                <TextField
+                  label="Lieferschein-Nr."
+                  size="small"
+                  value={getNextShipmentNumber(currentOrder.number, currentOrder.shipments)}
+                  disabled
+                  slotProps={{ input: { readOnly: true } }}
+                  sx={{ width: 190 }}
+                />
+              ) : null}
               <TextField
                 label="Referenz"
                 size="small"