Proforma invoce Spliting

Hi Gurus,

I created one Sales Order having two line items. I did delivery And PGI. With reference to delivery I did Proforma Invoice. Here the Proforma invoice (JEX) is splitted ( Each line item wise.i.e system genarated two proforma Invoices.).

Shall I know what is the reason.? In the Proforma Invoice I checked the Split Analysis. But it is in disply mode. How to analyse this what is the reason?

Regards,