Why cannot I select items in Custom Reports?

Why cannot I select items in Custom Reports?

This problem can occur if there are extra trailing white space characters in the 'Desc' field of a DIM table, the description field in filter pop up shows multiple records for the same sub category as these descriptions are showing after concatenating string from multiple columns. In such cases, remove the trailing white space from the column - 'desc'. However, the problem can persist due to the presence of the duplicate codes. Please ensure that there are unique codes. NOTE: With duplicate codes, in case you want to select an item then, you must select the very first item among the list of selections and then the subsequent selections. You will not be able to select items in between directly. However, this is true only in case of duplicate codes.