IO-1914 Inventory bugfixes.

client/src/components/bill-delete-button/bill-delete-button.component.jsx

@@ -15,7 +15,8 @@ export default function BillDeleteButton({ bill }) {
     setLoading(true);
     const result = await deleteBill({
       variables: { billId: bill.id },
-      update(cache) {
+      update(cache, { errors }) {
+        if (errors) return;
         cache.modify({
           fields: {
             bills(existingBills, { readField }) {
@@ -36,11 +37,22 @@ export default function BillDeleteButton({ bill }) {
     if (!!!result.errors) {
       notification["success"]({ message: t("bills.successes.deleted") });
     } else {
-      notification["error"]({
-        message: t("bills.errors.deleting", {
-          error: JSON.stringify(result.errors),
-        }),
-      });
+      //Check if it's an fkey violation.
+      const error = JSON.stringify(result.errors);
+
+      if (error.toLowerCase().includes("inventory_billid_fkey")) {
+        notification["error"]({
+          message: t("bills.errors.deleting", {
+            error: t("bills.errors.existinginventoryline"),
+          }),
+        });
+      } else {
+        notification["error"]({
+          message: t("bills.errors.deleting", {
+            error: JSON.stringify(result.errors),
+          }),
+        });
+      }
     }
 
     setLoading(false);