Solution : https://service.sap.com/sap/support/notes/785403 (SAP Service marketplace login required)
Key words : 
dataloader- field comm_prprdcatr-category_id remains empty solution, table comm_prprdcatr arenot set, terms mara prdhamktlmtart reason, latest patch accorcding, prior support  package, fields category_id, mara - prdha, downloading products, ipc version, longer exists
Related Notes : 
       
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