Hi I was having problems with that one as well. I added 4 Custom Dimensions, but they were either not filled, or all were filled with the same value, while 4 different values were correctly available. Naming the Dimensions solved that issue for me. You can add the name in the filed 'Name', or just as cdm.dimension17-YOUR_DIM_NAME_HERE-ecom. I hope that solves your issue as well.
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