Hi Artem,
it seems that the function module /MAC/RSFM_GET_BP_PRD_LISTING_I extracts the listings for the business partners only if the table CRMC_PRCPROC:DET contains the document pricing procedure field blank.
Try to add a new line without document pricing procedure by customizing:
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In my case, products are uploaded on Rex.
Let me know.
Best Regards