diff --git a/examples/crm/src/companies/CompanyInputs.tsx b/examples/crm/src/companies/CompanyInputs.tsx
index 2e85e094aa..e3c265b227 100644
--- a/examples/crm/src/companies/CompanyInputs.tsx
+++ b/examples/crm/src/companies/CompanyInputs.tsx
@@ -139,6 +139,7 @@ const CompanyAccountManagerInput = () => {
                     label="Account manager"
                     helperText={false}
                     optionText={saleOptionRenderer}
+                    validate={required()}
                 />
             </ReferenceInput>
         </Stack>
diff --git a/examples/crm/src/contacts/ContactInputs.tsx b/examples/crm/src/contacts/ContactInputs.tsx
index 544b77e681..acbdca27e9 100644
--- a/examples/crm/src/contacts/ContactInputs.tsx
+++ b/examples/crm/src/contacts/ContactInputs.tsx
@@ -185,6 +185,7 @@ const ContactMiscInputs = () => {
                     helperText={false}
                     label="Account manager"
                     optionText={saleOptionRenderer}
+                    validate={required()}
                 />
             </ReferenceInput>
         </Stack>