Invoice Order and Payment Document Generation Issue

Dear community,

When we create invoices we do it in a specific order like (Inv1,Inv2,Inv3) for one invoice batch.

Later when we query this batch we found that invoices order changed on screen (Inv1,Inv3,Inv2). The system is fetching invoices for payment in out of order.

Payment manager  randomly selected the invoices and generated the document number but we want  the system to choose according to the entered invoice number sequence:

Supplier     Invoice Number

Abc          Inv-1

Def           Inv-2

Ghi           Inv-3

Can you please advise how to do this?

thanks,

Alex