Can we make requisition mandatory for PO creation?

Summary:

we have business requirement: PO should error out without requisition.

we set requisition as a mandatory field by using sandbox, but it allows to create PO without requisition.

Content (required):

We need requisition field as mandatory in PO page to create purchase order.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):