Invalid Product/Service ID &.

What causes this issue?

An invalid value was transmitted for Product/Service ID.
Product/Service ID:
Identifying number for a product or service
Required by Joint Interest Billing Exchange.
<ZH>810 Invoice:</>
IT101/IT107
Service Code. This is a 2 character field
IT109
Identifies whether the corresponding Operating Expense Statement was
sent electronically via the clearing house or on paper.
E = Electronically
P = Paper
<ZH>819 Operating Statement:</>
JIBE Class. This is a 3 character field
For the United States only the first character of JIBE Class
will be used.
JIBE Subclass A. this is a 5 character field

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?

A) Correct the 810`s Service Code or the 819`s JIBE Class and JIBE
Subclass A mapping.
Reprocess the IDOC.
OR
B) A new transmission is required to correct this problem.

Error message extract from SAP system. Copyright SAP SE.