Final answer:
The custom field named Special Message will be available on the generated invoice itself in a designated area for additional information or personalized messages.
Step-by-step explanation:
Once the invoice has been generated, the custom field named Special Message will be available on the generated invoice itself. It will typically appear in a designated area, such as a special message section, where additional information or personalized messages can be included.
For example, on an electronic invoice, the Special Message field might be displayed in a prominent place, such as at the top or bottom of the invoice.
Overall, the Special Message custom field gives businesses the flexibility to include specific instructions, personalized notes, or any other relevant information on the generated invoice.