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When changing formatting for a calculated column or table column, it fails to change the preview in table view. This might work for the first format change, but second or third attempt will show the column not updating with changed formatting.
This also then affects relationship building, as the pop-up dialog that opens up when adding a relationship cannot preview data and won't let you save the relationship.
I've found 3 ways to force PBI to update the formatting:
1. save, close and open up the report again
2. delete an existing relationship
3. Reload a table to the semantic model (right-click on table name, and choose "Refresh data"
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