Field is obsolete (Do not use any longer)

What causes this issue?

The fields you populated (sales organization, division, and
distribution channel) are obsolete.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please maintain the sales area in SAP R/3 Customizing under Integration
With Other mySAP.com Components -> Advanced Planner and Optimizer (SAP
APO) -> Application-Specific Settings and Enhancements -> Enhancements
for Sales Orders -> Settings for Vendor-Managed Inventory (VMI) ->
Assign Sold-To Party/Plant to Sales Area and Order Category.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.