BSEG will contains all items data.

try to make use of this FM
AC_DOCUMENT_RECORD.
or

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call function 'FI_DOCUMENT_RECORD'
exporting
i_awtyp = 'RMRP'
i_awref = w_awref1 --->IR number of PO
i_aworg = w_gjahr1----.year
 
I_AWSYS = ' '
I_AWTYP_INCL = ' '
I_AWTYP_EXCL = ' '
I_BUKRS = ' '
tables
t_documents = t_doc.