Do not fill field IV_CATEGORY

What causes this issue?

You have entered a value in the field IV_CATEGORY in the header data
structure of the incoming invoice. This field describes the origin of
the Logistics Invoice Verification document.

System Response

If there is a value in the field IV_CATEGORY, the system cannot use
function module BAPI_INCOMINGINVOICE_CREATE to create an invoice
document.
If the field IV_CATEGORY is blank, the system uses the BAPI to create
an invoice document and automatically fills the field IV_CATEGORY with
<LS>B</>.
<ZH>Exception</>
If you want to enter an invoice via the Internet, enter <LB>9</> in the
field IV_CATEGORY.

How to fix this error?

Do not enter <ZH>any</> values in the field IV_CATEGORY.

Error message extract from SAP system. Copyright SAP SE.