How To Fix VC045 - Sales area without customer number is not defined

VC045 - Overview

• Message type: E = Error

• Message class: VC - SD Customizing

• Message number: 045

• Message text: Sales area without customer number is not defined

What causes this issue?

You must always specify a customer number and a complete sales area for
a higher-level assignment when maintaining assignments in a
<GL:customer_hierarchy>customer hierarchy</>.
You may not specify a higher-level customer number or a higher-level
sales area if a node should not have a higher-level assignment.

Error message extract from SAP system. Copyright SAP SE.

VC045 - Details

• The SAP error message VC045, "Sales area without customer number is not defined," typically occurs when you are trying to create or process a sales document (like a sales order or quotation) in SAP, but the system cannot find a valid customer number associated with the specified sales area. This can happen for various reasons, and here are the causes, solutions, and related information:
  Causes:
  
  Missing Customer Master Data: The customer master data may not be created for the specific sales area (Sales Organization, Distribution Channel, and Division).
  Incorrect Sales Area: The sales area specified in the transaction may not be correctly defined or may not match any existing customer master records.
  Customer Not Assigned to Sales Area: The customer may exist, but it is not assigned to the sales area you are trying to use.
  Data Inconsistency: There may be inconsistencies in the data, such as missing or incorrect entries in the customer master