Sales Person to be made mandatory based on Sales Order Type

Summary

for few of the sales order types, the Sales Person should be mandatory field in the sales order header.

Content

The requirement is to make the Sales Person field mandatory on the Sales Order header based on the Sales Order Type.

For few Order Types, the Sales Person field on the Order Header should be made Mandatory and for rest of the Order Types the Sales Person field is optional.

When Sales Order is created, based on what is selected in the Order Type field, the Sales Person field should be made optional or mandatory