Unable to see measure data loaded at aggregate level to disaggregate to lowest level in demand plan

Summary:

i have loaded the data for a custom measure at aggregate product level but the data is not getting disaggregated at the lower levels.

Content (please ensure you mask any confidential information):

the data for the measure is stored at the lowest level, and i have tested with all the disaggregation parameters, but still the data is not disaggregated at the lowest level when loaded at the aggregated level.

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Code Snippet (add any code snippets that support your topic, if applicable):