If the data target and data source outlines are identical except for different member formulas, ensure that the partition definition produces the calculation results you want.
For example, suppose that the data source and data target outlines both contain a Market dimension with North and South members, and children of North and South. On the data target, Market is calculated from the data for the North and South members (and their children) on the data source. If any of these members on the data source contains member formulas, these formulas are calculated, affecting the calculated value of Market on the data target. These results may be different from how the Market member are calculated from the North and South members on the data target, where these formulas may not exist.
Ensure that any formulas you assign to members in the data source and data target produce the results you want.