diff --git a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
index 6c67d0608..928aac88a 100644
--- a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
+++ b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
@@ -141,7 +141,9 @@ export function JobLinesUpsertModalComponent({
             rules={[
               ({ getFieldValue }) => ({
                 validator(rule, value) {
-                  if (!!getFieldValue("mod_lbr_ty") === !!value) {
+                  if (
+                    !!getFieldValue("mod_lbr_ty") === (!!value || value === 0)
+                  ) {
                     return Promise.resolve();
                   }
                   return Promise.reject(