There is ABAP Tips(eBook version) for you, if you need it , pls download it.

abap-tips

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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.

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There is an ABAP program tips document(157 pages) to download. I think it is very useful for ABAP developer.
Download abap program tips-v3

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