Need help to make Receivable transaction type mandatory in Sales order line through OM Extension

Summary:

Need help to make Receivable transaction type mandatory in Sales order line through OM Extension

Content (required):

We are trying to make receivable transaction type field as mandatory field through sandbox, but that is not working, we are looking to achieve through OM extension

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

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