I have a matrix with the total column as the last column. I want a detail field to reflect a % of what the total field is. So something like this, which doesn't work, which is my issue, any thoughts?

Depending on which total you want, just divide by a sum scoped to the entire
matrix or matrix group name. E.g.:
=Sum(Fields!QUANTITY.Value) / Sum(Fields!QUANTITY.Value, "MatrixName")

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field to reflect a % of what the total field is. So something like this,
which doesn't work, which is my issue, any thoughts?
[quoted text, click to view]