Dataflow output different then preview

[ChielFaber]

Hello everyone,

I'm experiencing a problem with my PowerBI dataflow output.

I've made an id-field in the dataflow and when I take a look at the last step (Result) it shows the created id-fields per row:

When I go ahead and save the dataflow and load this into a PowerBI desktop file not all the rows generate an output and I get blank rows. I've looked up this particular record (5470010100) as having a blank value as output despite showing in the preview. 

Most values are showing but certain others aren't showing as well. I have two tables using this ID and in both the exact same values are missing.

Also when loading the dataflow output into a datamart the exact same values are missing.

Have any of you experienced the same problem and know a solution?

Regards,

Chiel

[ChielFaber]

Thanks James your line of thought solved the problem. Much appreciated

[JamesRobson · Accepted solution]

Hi,

 I had a similar issue recently that turned out to be formatting further up the chain. A Date in Text format had been changed using the change type rather than a Date.FromText formula so although it displayed in the preview when loading to excel the cells were all blank.

Might be worth checking the source and all steps to see if the format has been chnaged incorrectly? (Maths on a number set as a Text field could cause the same issue I guess??).

Hope that helps