How To Fix WB2B421 - Sales Order Item Category &1 is not allowed for Sales order type &3

SAP Error Message - Details

• Message type: E = Error

• Message class: WB2B - Trading Contract

• Message number: 421

• Message text: Sales Order Item Category &1 is not allowed for Sales order type &3

What causes this issue?

Sales Order Category &V1& of Trading Contract Category &V2& is not a
valid entry for creating a Sales Order Item. The Item Category &V1& is
not maintained within the Sales Order Item Category Customizing.

System Response

The system does not allow further processing of this item &V4&

How to fix this error?

Check your entry.
Choose another entry or maintain the Sales Order Item category so that
the value is allowed within the Sales Order entry process.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.