If cubes contain parametric dimensions, control over parameters of these dimensions can be set up via other cube dimensions. Values of specific attributes should be passed as parameter values. This wizard page shows all parametric dimensions.
The Parameters box shows parameters of dimensions and the query, controlling dimensions of which can be defined.
Clicking the Edit button opens the Control Parameter Properties dialog box:
The dialog box is used to set the following parameters:
Controlling Dimension. Select the dictionary that contains the controlling dimension in the drop-down list.
Controlling Expression. An expression for the controlled parameter is set in the Expression Editor dialog box opened by clicking the 
button. Data area of the formula editor displays each attribute of the controlling dictionary with the following 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. This function passes the array of attribute values of all elements included into 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 are not to be determined for the controlled parameter on clicking the Clear button.
See also:
Multidimensional Calculation on DB Server