diff --git a/backend/services/productionOrderService.js b/backend/services/productionOrderService.js
index 832c624..7f658e0 100644
--- a/backend/services/productionOrderService.js
+++ b/backend/services/productionOrderService.js
@@ -1195,7 +1195,9 @@ const isSellableComposition = (order) => {
 };
 
 const getTinyProductIdFromCompositionReference = (tinyId) => (
-    tinyId.slice(TINY_OLIST_V3_COMPOSITION_PREFIX.length)
+    tinyId.startsWith(TINY_OLIST_V3_COMPOSITION_PREFIX)
+        ? tinyId.slice(TINY_OLIST_V3_COMPOSITION_PREFIX.length)
+        : tinyId
 );
 
 const normalizeCompositionComponents = (components) => {
@@ -1291,6 +1293,7 @@ const findProductCompositionsBySource = async (source, productId, client = pool)
           AND (
               $2 = ''
               OR composition.finished_tiny_product_id = $2
+              OR composition.external_source_id = $2
               OR composition.finished_product_sku = UPPER($2)
           )
         ORDER BY composition.finished_product_sku, composition.finished_product_description;
diff --git a/backend/test/productCompositionService.test.js b/backend/test/productCompositionService.test.js
index 4b03fe6..9117a60 100644
--- a/backend/test/productCompositionService.test.js
+++ b/backend/test/productCompositionService.test.js
@@ -208,7 +208,7 @@ const withFakeDatabase = async (run) => {
         if (normalizedSql.includes('FROM product_compositions composition')) {
             const compositions = state.compositions.filter(item => (
                 item.source === params[0]
-                && (params[1] === '' || item.finished_tiny_product_id === params[1] || item.finished_product_sku === String(params[1]).toUpperCase())
+                && (params[1] === '' || item.finished_tiny_product_id === params[1] || item.external_source_id === params[1] || item.finished_product_sku === String(params[1]).toUpperCase())
             ));
             return {
                 rows: compositions.map(composition => ({
@@ -342,6 +342,36 @@ test('product composition detail lookup returns stored components', async () =>
     });
 });
 
+test('product composition detail lookup supports an exported composition linked by external product ID', async () => {
+    await withFakeDatabase(async () => {
+        const response = await invokeHandler(tinyCompositionImportHandler, {
+            body: {
+                compositions: [{
+                    externalSourceId: '919483307',
+                    finishedProductSku: 'BLCS.PTO.G',
+                    finishedProductDescription: 'BASE LISA CAMISETA COR PRETO TAMANHO - G',
+                    finishedProductUnit: 'UN',
+                    finishedTinyProductId: '',
+                    components: [{
+                        componentSku: 'ETIQ.T.G',
+                        componentName: 'ETIQUETA DE TAMANHO G',
+                        quantityPerUnit: 1,
+                        unit: 'UN'
+                    }]
+                }]
+            }
+        });
+
+        assert.equal(response.statusCode, 201);
+
+        const detail = await invokeHandler(productCompositionHandler, { params: { productId: '919483307' } });
+        assert.equal(detail.statusCode, 200);
+        assert.equal(detail.body.composition.finishedProductSku, 'BLCS.PTO.G');
+        assert.equal(detail.body.composition.finishedTinyProductId, '919483307');
+        assert.equal(detail.body.composition.components.length, 1);
+    });
+});
+
 test('product composition export endpoint returns every stored composition', async () => {
     await withFakeDatabase(async () => {
         await invokeHandler(tinySyncHandler, { body: compositionPayload() });