You have entered &1 order type - only type 01 is allowed

What causes this issue?

<ZH>Only</> CO internal orders <ZH>(order type 01)</> can be used as an
account assignment for QM orders. The order you entered is of type
&v1&.

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 the account assignment entry.

Error message extract from SAP system. Copyright SAP SE.