Maximum of 3 different tax codes possible

What causes this issue?

You have attempted to use more than 3 tax codes within an invoice that
is to be posted net.

System Response

When a "net" posting is made, a maximum of 3 different tax codes are
allowed within one invoice for technical reasons.

How to fix this error?

Check what you have entered. If the invoice contains more than 3
different tax codes, you have to split up the invoice into several
documents, each with a maximum of 3 tax codes.
Note that if you are making a cross-company-code posting, the system
might recognize the same tax code differently in different company
codes.
Example: You only use the tax code 'V1'. You enter an invoice for four
company codes, in other words, the system recognizes four tax codes.
The invoice cannot be processed. You must distribute the invoice across
several documents.

Error message extract from SAP system. Copyright SAP SE.