Ajuda p/o campo (PYHPURTYP) 

Indicate if the payment is linked to a purchase of goods and services or to fixed assets. The possible values of this field are defined in local menu 646.

In this case, the VAT accounts with movements created on payment posting can vary. Using the payment transaction and automatic journals, you can also define various posting structures for the notes payable/receivable posting depending on the purchase type.