Please review the following step:
1. Create a calculated field with the following code:Calculation: LOOKUP(MAX(DATETRUNC('month', [Ship Date])),0)
2. Drag the new calculated field to the Columns shelf and right-click to Compute Using > Cell.
3. Drag the calculated field to the Filters shelf and select all values. Right-click to select Continuous.
4. Set the filter as a Relative Date filter and select the last 12 months as shown below.
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