Company code &1 is not assigned to sales organization &2

What causes this issue?

The <GL:company_code>company code</> is neither directly nor indirectly
allocated to the <GL:sales_organization>sales organization</>. Table
TVKO is used for direct allocation, in which correct assignment of a
sales organization to a company code is set. In addition,
<GL:plant>plants</> which are allocated to company codes and
<GL:valuation_area>valuation areas</> using tables T001W und T001K are,
in turn, assigned to the sales organization using table TVKWZ (indirect
allocation of company codes to sales organizations).

Error message extract from SAP system. Copyright SAP SE.