How to change Dimension of Field on View

Hi,

I have got ITEM field from Table 1 which has got data type as NVARCHAR and DIM as "6" and another ITEM field from Table 2 has got data type as NVARCHAR but DIM is "4". I have 2 Analytic View and each ITEM is available in each Analytic View. I have joined these two analytic view in Calculation view with ITEM field joined. But it retrieved ZERO results and I do UNION then it retrieve more records. Like couple of rows from TABLE 1 and couple records from ITEM 2. Where as it should be only 1 row.

I have tried to do changes in SLT but it is not giving option changing the DIM.

Please provide suggestion on this.

Thanks in advance

Rahim