No unique sales area found for goods recipient &1

What causes this issue?

You want to plan replenishments for a customer to which no plant has
been assigned (for example, in conjunction with
vendor-managed-inventory (VMI)).
In this case, the customer specified in the replenishment master data
is viewed as the recipient of the goods. The recipient must be assigned
a unique sales area and sold-to party in the customer master record.
The system could not find a unique sales area for the goods recipient.

System Response

No replenishments can be planned for this recipient.

How to fix this error?

Assign the goods recipient a unique sales area. For an overview of all
sales areas assigned to the goods recipient, see the initial screen of
the customer master (by choosing Extras -> Sales areas -> Sales
area/customer).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.