Changed logic in production plan page against plant code checking item code

app/Filament/Resources/ProductionPlanResource.php

@@ -839,22 +839,32 @@ class ProductionPlanResource extends Resource
                             $itemCodes = [];
 
                             foreach ($csv->getRecords() as $record) {
-                                $itemCode = trim((string) ($record['Item Code'] ?? ''));
 
-                                if ($itemCode !== '') {
+                                $values = array_values($record);
-                                    $itemCodes[] = $itemCode;
+
+                                $plantCode = trim((string) ($values[0] ?? ''));
+                                $itemCode = trim((string) ($values[1] ?? ''));
+
+                                if ($plantCode === '' || $itemCode === '') {
+                                    continue;
                                 }
+
+                                $key = $plantCode . '|' . $itemCode;
+
+                                $itemCodes[] = $key;
                             }
 
                             $duplicates = collect($itemCodes)
                                 ->duplicates()
                                 ->unique()
+                                ->values()
+                                ->map(fn ($duplicate) => explode('|', $duplicate)[1])
+                                ->unique()
                                 ->values();
 
                             if ($duplicates->isNotEmpty()) {
                                 $fail(
-                                    'Duplicate Item Codes found: ' .
+                                    'Duplicate Item Codes found: ' . $duplicates->implode(', ')
-                                    $duplicates->implode(', ')
                                 );
                             }
                         },