Logic in PCA extraction

Hello,
I need to add field MATNR to the extract structure for data source 0EC_PCA_1 (ISPCACST) in order to be able to report on material number. But how should the user exit for this be written?
I know that the original table for actual PCA postings is GLPCA and the plan postings are in table GLPCP. All postings end up in table GLPCT (aggregated per period) and then function module ECPCA_BIW_GET_DATA reads this and populates structure ISPCACST. Am I right?
But how do I write the user exit code so that MATNR is added and populated in ISPCACST? Which is the source table to use? I would have guessed on GLPCT (since this seems to be used for 0EC_PCA_1) but I can't find MATNR in this one.
How come ds 0EC_PCA_3, which uses the same function module for extraction, and thereby reads from the same source table: GLPCT, includes MATNR?
Please explain the logic of this and I'll be eternally greatful! :-)..
Best regards,
Fredrik

pooja,
It depends upon which fields you have defined as key fields in the DSO.
If the "creation date" is a key field, then the system will load the records as 2 separete records.
Thanks.

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Message was edited by:
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Logic in PCA extraction

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