Attributes selection on data forms making data grid as read only, can we make it editable

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Hi All

We are preparing the data forms where user wants to filter the entity hierarchy on forms using attributes to input the numbers. 

Country is an attribute dimension, created the user variable and enable the dynamic user variable on form to do selection on attribute dimension country for selected entity region.

The movement when I add the attribute, complete form turned into read only form, not allowing to input numbers.

If we try entering data, getting below error

"Cannot save data with attribute members on a grid" 

Is it an expected behavior of EPBCS?

How can we make it editable using attributes on data form?