how many possible ways to upload Retail Periodic Discounts in AX 2012 R3.
i just checked DMF only Mix & Match is available and on Excel Add In there are many errors/issues.
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I have the same question (0)You can use the utility shared in the below link to get the job done.
https://vinayofvarghese.wixsite.com/dynamicsolution/post/import-retail-offers-discounts