Invoice simulation issue

Dear Gurus,

PO has has raised for 4 items each with Qty 500

item1 500 qty value 4990 Eur

item2 500 qty value 4990 Eur

item3 500 qty value 460 Eur

item4 500 qty value 460 Eur

GR happened for

item1 491 qty value 4900.18 Eur

item2 500 qty value 4990 Eur

item3 500 qty value 460 Eur

item4 500 qty value 460 Eur

at the same time i mean same material document

now when i am doing IR

its showing 4 items

item1 491 qty value 4900.18 Eur

item2 500 qty value 4990 Eur

item3 500 qty value 460 Eur

item4 500 qty value 460 Eur

but when i am simulating its showing 1st item , and showing debit of 5910 which is a total of Item2,3,4

its not showing vendor G/L account number its showing only GR/IR clearing G/L account number.

than i did i have selected only item 2,3 and 4 and simulated its showing vendor G/L number and GR/IR clearing account also.

Please help how can i Proceed to slove this issue

Regards

venu