Material & does not exist in sales unit &

What causes this issue?

You tried to include material &V1&, in sales unit &V2&, in the markdown
plant. However, the sales unit is not valid for the distribution chain
you entered.

System Response

Material &V1& is included in the markdown plan in the sales unit that
is valid for the distribution chain.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.