APO/BW: How to get back from APO to BW/ How the send data from BW to APO

Question

Hi,
1. I read that BW is the “data layer” for APO DP and therefore, I expected data to flow from BW, the data layer, to APO DP but not the reverse. Yet, I also read that “data can be transferred from ‘Livecache’ back to BW by using the ‘extractor technology’ from BW. Can you clarify this for me?
2. If possible, please provide the steps to use this extractor technology to extract data back to BW in detail so that I can try it.
Thanks

Answer 1

Hi Amanda,
1. The data flow is from BW to APO, and from APO to BW.
from bw to apo, to feed planning area, characteristic value combination, in APO we have infocube to feed the data, as we know APO has BW inside (all the tcodes RSA1 etc are valid), datamart scenario is used here, we create infocube in APO, update rules, infosource and assign datasource from BW.
The data flow from APO to BW, to get the plan data inputted by user, we generate datasource in APO from planning area (compare with 'generate export datasource' from infocube), transaction /SAPAPO/SDP_EXTR. 'extractor technology' here in practice is just like when we are using datasource
take a look
http://help.sap.com/saphelp_scm50/helpdata/en/c9/199170f13711d4b2f20050da385632/frameset.htm
2. as mentioned in #1, you can use the transaction /SAPAPO//SAPAPO/SDP_EXTR to handle planning area-datasources in APO, or /SAPAPO/MSDP_ADMIN - planning area; choose your planning area, and menu extractor tools (or generate datasources), again datamart scenario is used here, after the datasource generated in APO, it's replicated in BW (APO act as source system), the rest steps are just same as when extract data from other SAP source system
simply what you need to practice is /SAPAPO/SDP_EXTR to 'generate export datasource', the rest steps should be familiar already for you
check
http://help.sap.com/saphelp_scm50/helpdata/en/8f/9d6937089c2556e10000009b38f889/frameset.htm
http://help.sap.com/saphelp_scm50/helpdata/en/e0/9088392b385f6be10000000a11402f/frameset.htm
hope this helps.