fetch notes(text) entered for a keyfigure in Planning book into the XYZ field of datasource

Hi Experts,

My requirement is to fetch notes(text) entered for a keyfigure in Planning book into the XYZ field of datasource(datasource generated from Planning Area and enhanced the datasource with XYZ field).This notes is visible in TCode /SAPAPO/SDP_NOTES  for a particular line item.

I tried using  FM  /SAPAPO/MSDP_NOTE_READ passing DOCID(retrieved DOCID from /1APO/F530000022 table) but it returned nothing.
Also tried using  FM  /SAPAPO/MSDP_NOTE_WRITE passing DOCID, it returned values .But when I pass these values in FM READ_TEXT, it returned nothing.

/SAPAPO/MSDP_NOTE_READ has two import parameters: DOCID, DOCID25.

How to get DOCID,DOCID25 values.

Please suggest whether approach is correct to get the notes into the datasource.

Thanks,

K Srinivas