Based on YOU being the last poster in that previous thread a year ago… I’m assuming you’re still looking for a way to do this?
MtlTags is a pain to work with! But if you want to try the CallContextBpmData route I walked through an exercise to pass CCBpmD to MtlTags in the below thread. You’ll have to carve out the portions for your use case (the post was trying to push LaborDtl data from MES to the tags). But if its helpful…