I little difficult to understand what you are trying to do without seeing your twbx workbook
Based on the post title - an LOD is not a potential to the problem as stated - running totals are a cable calculation which is well below LOD's on the order of operation
There may be other ways to get the result you are looking for - other table calcs can be nested with your running sum - but can't tell from the description of the problem
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could you please elaborate your question.
Please provide sample dataset/twbx file also.