Hi,
All templates are stored under path,
For AP invoice:
C:\Program Files (x86)\SAP\Data Transfer Workbench\Templates\Templates\Purchasing\AP Invoice
For outgoing payment:
C:\Program Files (x86)\SAP\Data Transfer Workbench\Templates\Templates\Banking\Outgoing Payments\Outgoing Payments
Note: Under same path can refer sample template before uploading original data
Thanks & Regards,
Nagarajan