The gross price and net price have different zones in price group &4

What causes this issue?

In billing document &v1& the gross price/document line item
&v2& has no document line item to process the net elements of this
gross price. The above gross price is a block price. Therefore, all net
elements of this gross price must also be block prices. Each price of
the gross group must have the same block. The only difference between
the above gross price and the net price/document line item
&v3& is the price block.

System Response

INCLUDE ISU_VERARB OBJECT DOKU ID TX

How to fix this error?

Check the blocks of these prices.
If the problem persists, contact SAP. Include the following data in
your message:
Billing document,,&v1&
Gross group,,&v4&
Gross price/document line item,,&v2&
Net price/document line item,,&v3&

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.