Tax code (&1,&2) not assigned to tax type on &3

What causes this issue?

Tax code (&v1&, &v2&) is not assgined to a tax type and tax group in
Customizing for Flexible Real Estate Management.

System Response

If the message is set up as a warning, the document is not included in
input tax distribution. If the message is not a warning, the document
cannot be posted.

How to fix this error?

Add the necessary settings in Customizing.

Procedure for System Administrators

Contact your system administrator.
INCLUDE RECA_CUSTOMIZED_MESSAGE_INFO OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.