Sales organization &1 is not assigned to the specified company codes

What causes this issue?

The specified sales organization is not assigned to any of the specified
company codes.
&NOTE&
If you have not explicitly entered a company code, the system
automatically applies all company codes that are assigned to the
controlling area that has been set.

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?

Change your entry so that all sales organizations are assigned to the
specified company codes. If necessary, use the relevant input help.
If you do not specify a sales organization, the system automatically
applies all sales organizations that are assigned to the specified
company codes.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.