If a cube contains parametric dimensions, one can set up control over parameters of these dimensions via cube dimensions. In this case values of specific attributes should be passed as parameter values.
TIP. If a cube is used as an indicator in a data entry form, it has parametric dimensions and it is required to control these dimensions using other cube dimensions, use this setting for the cube.
All parametric dimensions are displayed on the Controlling Dimensions page:
To set up the selected controlling dimension, click the Edit button:
The following parameters are set in the dialog box that opens:
Controlling Dimension. In the drop-down list select the dictionary, which attribute values are passed as a parameter value.
Controlling Expression. The expression, based on which parameter value will be calculated. The controlled parameter expression is set in the expression editor, which opens on clicking the 
Expression Editor button. In the expression editor in the data area each attribute of the controlling dictionary will be displayed with functions:
First. Value of the first element attribute in the existing controlling dimension selection is passed to the parameter.
Last. Value of the last element attribute in the existing controlling dimension selection is passed to the parameter.
All. The function passes the array of attribute values of all elements existing in the controlling dimension selection. This function should not be used as it is. It is required to pass the array of values to a custom function, which calculates the value and passes it to the parameter of the controlling dimension.
A controlling dimension and expression will not be determined for the controlled parameter on clicking the Clear button.
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