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It is impossible to drag a unit of measurement from one group to another.

If you want to change the UOM name or its coefficient in relation to the base UOM:

Select the unit of measurement whose properties you want to change
Use the UOM properties item of the context menu or the Document > UOM properties main menu item
Make the necessary changes
Save the changes using the Document > Save document main menu item or the button on the toolbar.

When changing the coefficient in the Units of measurement dictionary, the coefficients in goods cards using this UOM will not be recalculated.